18 files changed, 813 insertions, 146 deletions

diff --git a/.gitignore b/.gitignore
index 323c2fc40..2577fafa1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,5 @@ packages
 changelog-news.txt
 binfiles.wxs
 .idea/
+.vs/
+
diff --git a/Duplicati CommandLine Only.sln b/Duplicati CommandLine Only.sln
index 7a35ce3b7..9fbe16e41 100644
--- a/Duplicati CommandLine Only.sln
+++ b/Duplicati CommandLine Only.sln
@@ -1,6 +1,8 @@
 

-Microsoft Visual Studio Solution File, Format Version 11.00

-# Visual Studio 2010

+Microsoft Visual Studio Solution File, Format Version 12.00

+# Visual Studio 15

+VisualStudioVersion = 15.0.26730.12

+MinimumVisualStudioVersion = 10.0.40219.1

 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Library.Utility", "Duplicati\Library\Utility\Duplicati.Library.Utility.csproj", "{DE3E5D4C-51AB-4E5E-BEE8-E636CEBFBA65}"

 EndProject

 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Library.Main", "Duplicati\Library\Main\Duplicati.Library.Main.csproj", "{10D2D1B7-C664-41D8-9B3A-00040C3D421B}"

@@ -79,6 +81,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Library.Backend.S
 EndProject

 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Tools", "Duplicati\Tools\Duplicati.Tools.csproj", "{0797AA22-C5DD-4950-BB60-34765AB8C6DD}"

 EndProject

+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Library.Backend.Sia", "Duplicati\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj", "{32A74526-3E5F-413A-8CB4-1EFDAD4C8B91}"

+EndProject

 Global

 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

 		Debug|Any CPU = Debug|Any CPU

@@ -241,10 +245,17 @@ Global
 		{0797AA22-C5DD-4950-BB60-34765AB8C6DD}.Debug|Any CPU.Build.0 = Debug|Any CPU

 		{0797AA22-C5DD-4950-BB60-34765AB8C6DD}.Release|Any CPU.ActiveCfg = Release|Any CPU

 		{0797AA22-C5DD-4950-BB60-34765AB8C6DD}.Release|Any CPU.Build.0 = Release|Any CPU

+		{32A74526-3E5F-413A-8CB4-1EFDAD4C8B91}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

+		{32A74526-3E5F-413A-8CB4-1EFDAD4C8B91}.Debug|Any CPU.Build.0 = Debug|Any CPU

+		{32A74526-3E5F-413A-8CB4-1EFDAD4C8B91}.Release|Any CPU.ActiveCfg = Release|Any CPU

+		{32A74526-3E5F-413A-8CB4-1EFDAD4C8B91}.Release|Any CPU.Build.0 = Release|Any CPU

 	EndGlobalSection

 	GlobalSection(SolutionProperties) = preSolution

 		HideSolutionNode = FALSE

 	EndGlobalSection

+	GlobalSection(ExtensibilityGlobals) = postSolution

+		SolutionGuid = {3221EB9F-EE08-460E-B236-CD594688FC5F}

+	EndGlobalSection

 	GlobalSection(MonoDevelopProperties) = preSolution

 		StartupItem = Duplicati\CommandLine\Duplicati.CommandLine.csproj

 		Policies = $0

@@ -254,7 +265,7 @@ Global
 		$0.DotNetNamingPolicy = $2

 		$2.DirectoryNamespaceAssociation = PrefixedHierarchical

 		$2.ResourceNamePolicy = FileFormatDefault

-		$0.TextStylePolicy = $3

+		$0.TextStylePolicy = $5

 		$3.inheritsSet = VisualStudio

 		$3.scope = text/plain

 		$3.FileWidth = 120

@@ -288,7 +299,6 @@ Global
 		$4.inheritsSet = Mono

 		$4.inheritsScope = text/x-csharp

 		$4.scope = text/x-csharp

-		$0.TextStylePolicy = $5

 		$5.FileWidth = 120

 		$5.EolMarker = Windows

 		$5.inheritsSet = VisualStudio

diff --git a/Duplicati.sln b/Duplicati.sln
index 3ffa84026..a9f0d8dc5 100644
--- a/Duplicati.sln
+++ b/Duplicati.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2012
-VisualStudioVersion = 14.0.24720.0
+# Visual Studio 15
+VisualStudioVersion = 15.0.26730.12
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Library.Utility", "Duplicati\Library\Utility\Duplicati.Library.Utility.csproj", "{DE3E5D4C-51AB-4E5E-BEE8-E636CEBFBA65}"
 EndProject
@@ -95,64 +95,74 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Tools", "Duplicat
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Library.Backend.Jottacloud", "Duplicati\Library\Backend\Jottacloud\Duplicati.Library.Backend.Jottacloud.csproj", "{2CD5DBC3-3DA6-432D-BA97-F0B8D24501C2}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Duplicati.Library.Backend.Sia", "Duplicati\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj", "{32A74526-3E5F-413A-8CB4-1EFDAD4C8B91}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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 		$3.scope = text/plain
-		$0.TextStylePolicy = $4
 		$4.FileWidth = 120
 		$4.TabsToSpaces = True
 		$4.EolMarker = Windows
@@ -345,9 +359,6 @@ Global
 		$9.RequiredSuffixes = $11
 		$11.String = Exception
 	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
 	GlobalSection(SubversionScc) = preSolution
 		Svn-Managed = True
 		Manager = AnkhSVN - Subversion Support for Visual Studio
diff --git a/Duplicati/CommandLine/BackendTester/Duplicati.CommandLine.BackendTester.csproj b/Duplicati/CommandLine/BackendTester/Duplicati.CommandLine.BackendTester.csproj
index db59f1925..5d0066f67 100644
--- a/Duplicati/CommandLine/BackendTester/Duplicati.CommandLine.BackendTester.csproj
+++ b/Duplicati/CommandLine/BackendTester/Duplicati.CommandLine.BackendTester.csproj
@@ -78,6 +78,10 @@
       <Project>{59C8BBC5-6E42-46FB-AB3E-6C183A82459A}</Project>

       <Name>Duplicati.Library.Backend.SharePoint</Name>

     </ProjectReference>

+    <ProjectReference Include="..\..\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj">

+      <Project>{32a74526-3e5f-413a-8cb4-1efdad4c8b91}</Project>

+      <Name>Duplicati.Library.Backend.Sia</Name>

+    </ProjectReference>

     <ProjectReference Include="..\..\Library\Utility\Duplicati.Library.Utility.csproj">

       <Project>{DE3E5D4C-51AB-4E5E-BEE8-E636CEBFBA65}</Project>

       <Name>Duplicati.Library.Utility</Name>

diff --git a/Duplicati/CommandLine/BackendTool/Duplicati.CommandLine.BackendTool.csproj b/Duplicati/CommandLine/BackendTool/Duplicati.CommandLine.BackendTool.csproj
index a765a568e..b992fdc8d 100644
--- a/Duplicati/CommandLine/BackendTool/Duplicati.CommandLine.BackendTool.csproj
+++ b/Duplicati/CommandLine/BackendTool/Duplicati.CommandLine.BackendTool.csproj
@@ -76,6 +76,10 @@
       <Project>{59C8BBC5-6E42-46FB-AB3E-6C183A82459A}</Project>

       <Name>Duplicati.Library.Backend.SharePoint</Name>

     </ProjectReference>

+    <ProjectReference Include="..\..\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj">

+      <Project>{32a74526-3e5f-413a-8cb4-1efdad4c8b91}</Project>

+      <Name>Duplicati.Library.Backend.Sia</Name>

+    </ProjectReference>

     <ProjectReference Include="..\..\Library\Backend\SSHv2\Duplicati.Library.Backend.SSHv2.csproj">

       <Project>{FF2BF37C-E502-4C98-BEA0-701671DDFA08}</Project>

       <Name>Duplicati.Library.Backend.SSHv2</Name>

diff --git a/Duplicati/CommandLine/Duplicati.CommandLine.csproj b/Duplicati/CommandLine/Duplicati.CommandLine.csproj
index 90b0d4c2d..c105aabb8 100644
--- a/Duplicati/CommandLine/Duplicati.CommandLine.csproj
+++ b/Duplicati/CommandLine/Duplicati.CommandLine.csproj
@@ -72,6 +72,10 @@
       <Project>{59C8BBC5-6E42-46FB-AB3E-6C183A82459A}</Project>

       <Name>Duplicati.Library.Backend.SharePoint</Name>

     </ProjectReference>

+    <ProjectReference Include="..\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj">

+      <Project>{32a74526-3e5f-413a-8cb4-1efdad4c8b91}</Project>

+      <Name>Duplicati.Library.Backend.Sia</Name>

+    </ProjectReference>

     <ProjectReference Include="..\Library\Compression\Duplicati.Library.Compression.csproj">

       <Project>{19ECCE09-B5EB-406C-8C57-BAC66997D469}</Project>

       <Name>Duplicati.Library.Compression</Name>

diff --git a/Duplicati/CommandLine/RecoveryTool/Duplicati.CommandLine.RecoveryTool.csproj b/Duplicati/CommandLine/RecoveryTool/Duplicati.CommandLine.RecoveryTool.csproj
index 64b0a88cb..36b99861b 100644
--- a/Duplicati/CommandLine/RecoveryTool/Duplicati.CommandLine.RecoveryTool.csproj
+++ b/Duplicati/CommandLine/RecoveryTool/Duplicati.CommandLine.RecoveryTool.csproj
@@ -103,6 +103,10 @@
       <Project>{59C8BBC5-6E42-46FB-AB3E-6C183A82459A}</Project>
       <Name>Duplicati.Library.Backend.SharePoint</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj">
+      <Project>{32a74526-3e5f-413a-8cb4-1efdad4c8b91}</Project>
+      <Name>Duplicati.Library.Backend.Sia</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\Library\Backend\SSHv2\Duplicati.Library.Backend.SSHv2.csproj">
       <Project>{FF2BF37C-E502-4C98-BEA0-701671DDFA08}</Project>
       <Name>Duplicati.Library.Backend.SSHv2</Name>
diff --git a/Duplicati/GUI/Duplicati.GUI.TrayIcon/Duplicati.GUI.TrayIcon.csproj b/Duplicati/GUI/Duplicati.GUI.TrayIcon/Duplicati.GUI.TrayIcon.csproj
index 452b32a40..507192cbd 100644
--- a/Duplicati/GUI/Duplicati.GUI.TrayIcon/Duplicati.GUI.TrayIcon.csproj
+++ b/Duplicati/GUI/Duplicati.GUI.TrayIcon/Duplicati.GUI.TrayIcon.csproj
@@ -313,6 +313,10 @@
       <Project>{3F47CB0C-CEE1-447F-9C26-7F8E419E3E3F}</Project>

       <Name>Duplicati.Library.Backend.AlternativeFTP</Name>

     </ProjectReference>

+    <ProjectReference Include="..\..\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj">

+      <Project>{32a74526-3e5f-413a-8cb4-1efdad4c8b91}</Project>

+      <Name>Duplicati.Library.Backend.Sia</Name>

+    </ProjectReference>   

     <ProjectReference Include="..\..\Library\Backend\Dropbox\Duplicati.Library.Backend.Dropbox.csproj">

       <Project>{B20A7CEE-9C5B-47B9-8B76-BC85ADFE8493}</Project>

       <Name>Duplicati.Library.Backend.Dropbox</Name>

diff --git a/Duplicati/Library/Backend/Sia/Duplicati.Library.Backend.Sia.csproj b/Duplicati/Library/Backend/Sia/Duplicati.Library.Backend.Sia.csproj
new file mode 100644
index 000000000..ec21380db
--- /dev/null
+++ b/Duplicati/Library/Backend/Sia/Duplicati.Library.Backend.Sia.csproj
@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{32A74526-3E5F-413A-8CB4-1EFDAD4C8B91}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <RootNamespace>Duplicati.Library.Backend.Sia</RootNamespace>
+    <AssemblyName>Duplicati.Library.Backend.Sia</AssemblyName>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>Duplicati.snk</AssemblyOriginatorKeyFile>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <UseMSBuildEngine>false</UseMSBuildEngine>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>full</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <ConsolePause>false</ConsolePause>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="Newtonsoft.Json">
+      <HintPath>..\..\..\..\packages\Newtonsoft.Json.10.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="CodeFile1.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Sia.cs" />
+    <Compile Include="Strings.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+  <ItemGroup>
+    <ProjectReference Include="..\..\Utility\Duplicati.Library.Utility.csproj">
+      <Project>{DE3E5D4C-51AB-4E5E-BEE8-E636CEBFBA65}</Project>
+      <Name>Duplicati.Library.Utility</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\OAuthHelper\Duplicati.Library.OAuthHelper.csproj">
+      <Project>{D4C37C33-5E73-4B56-B2C3-DC4A6BAA36BB}</Project>
+      <Name>Duplicati.Library.OAuthHelper</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\..\Localization\Duplicati.Library.Localization.csproj">
+      <Project>{B68F2214-951F-4F78-8488-66E1ED3F50BF}</Project>
+      <Name>Duplicati.Library.Localization</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\..\Interface\Duplicati.Library.Interface.csproj">
+      <Project>{C5899F45-B0FF-483C-9D38-24A9FCAAB237}</Project>
+      <Name>Duplicati.Library.Interface</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="Duplicati.snk" />
+    <None Include="packages.config" />
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/Duplicati/Library/Backend/Sia/Duplicati.snk b/Duplicati/Library/Backend/Sia/Duplicati.snk
new file mode 100644
index 000000000..e0c1e2dd8
--- /dev/null
+++ b/Duplicati/Library/Backend/Sia/Duplicati.snk
diff --git a/Duplicati/Library/Backend/Sia/Properties/AssemblyInfo.cs b/Duplicati/Library/Backend/Sia/Properties/AssemblyInfo.cs
new file mode 100644
index 000000000..5c49552a7
--- /dev/null
+++ b/Duplicati/Library/Backend/Sia/Properties/AssemblyInfo.cs
@@ -0,0 +1,43 @@
+//  Copyright (C) 2015, The Duplicati Team
+//  http://www.duplicati.com, info@duplicati.com
+//
+//  This library is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU Lesser General Public License as
+//  published by the Free Software Foundation; either version 2.1 of the
+//  License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful, but
+//  WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+// Information about this assembly is defined by the following attributes.
+// Change them to the values specific to your project.
+
+[assembly: AssemblyTitle("Duplicati.Library.Backend.Sia")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
+// The form "{Major}.{Minor}.*" will automatically update the build and revision,
+// and "{Major}.{Minor}.{Build}.*" will update just the revision.
+
+[assembly: AssemblyVersion("2.0.0.7")]
+
+// The following attributes are used to specify the signing key for the assembly,
+// if desired. See the Mono documentation for more information about signing.
+
+//[assembly: AssemblyDelaySign(false)]
+//[assembly: AssemblyKeyFile("")]
+
diff --git a/Duplicati/Library/Backend/Sia/Sia.cs b/Duplicati/Library/Backend/Sia/Sia.cs
new file mode 100644
index 000000000..673ebf689
--- /dev/null
+++ b/Duplicati/Library/Backend/Sia/Sia.cs
@@ -0,0 +1,433 @@
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using System.Net;
+
+using Duplicati.Library.Interface;
+using Duplicati.Library.Utility;
+using Newtonsoft.Json;
+
+namespace Duplicati.Library.Backend.Sia
+{
+    public class Sia : IBackend
+    {
+        private const string SIA_APIHOST = "sia-apihost";
+        private const string SIA_PASSWORD = "sia-password";
+        private const string SIA_TARGETPATH = "sia-targetpath";
+        private const string SIA_REDUNDANCY = "sia-redundancy";
+
+        private string m_apihost;
+        private int m_apiport;
+        private string m_targetpath;
+        private string m_password;
+        private float m_redundancy;
+        private System.Net.NetworkCredential m_user;
+
+        public Sia() {
+
+        }
+
+        public Sia(string url, Dictionary<string, string> options)
+        {
+            var uri = new Utility.Uri(url);
+
+            m_apihost = uri.Host;
+            m_apiport = uri.Port;
+            m_targetpath = uri.Path;
+
+            m_redundancy = 3.0F;
+            if (options.ContainsKey(SIA_REDUNDANCY))
+                m_redundancy = float.Parse(options[SIA_REDUNDANCY]);
+
+            if (m_apiport <= 0)
+                m_apiport = 9980;   
+
+            if (m_targetpath.StartsWith("/"))
+                m_targetpath = m_targetpath.Substring(1);
+
+            if (m_targetpath.Length == 0)
+                m_targetpath = "backup";
+
+            m_user = new System.Net.NetworkCredential();
+            if (options.ContainsKey(SIA_PASSWORD))
+            {             
+                m_user.Password = options[SIA_PASSWORD];
+            }
+        }
+
+        private System.Net.HttpWebRequest CreateRequest(string endpoint)
+        {
+            string baseurl = "http://" + m_apihost + ":" + m_apiport;
+            System.Net.HttpWebRequest req = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(baseurl + endpoint);
+
+            if (!string.IsNullOrEmpty(m_user.Password))
+            {
+                req.Credentials = m_user;
+                req.PreAuthenticate = true;
+            }
+
+            req.KeepAlive = false;
+            req.UserAgent = string.Format("Sia-Agent (Duplicati SIA client {0})", System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString());
+
+            return req;
+        }
+
+        public class SiaFile
+        {
+            [JsonProperty("siapath")]
+            public string Siapath { get; set; }
+            [JsonProperty("available")]
+            public bool Available { get; set; }
+            [JsonProperty("filesize")]
+            public long Filesize { get; set; }
+            [JsonProperty("uploadprogress")]
+            public float Uploadprogress { get; set; }
+            [JsonProperty("redundancy")]
+            public float Redundancy { get; set; }
+        }
+
+        public class SiaFileList
+        {
+            [JsonProperty("files")]
+            public SiaFile[] Files { get; set; }
+        }
+
+        public class SiaDownloadFile
+        {
+            [JsonProperty("siapath")]
+            public string Siapath { get; set; }
+            [JsonProperty("destination")]
+            public string Destination { get; set; }
+            [JsonProperty("filesize")]
+            public long Filesize { get; set; }
+            [JsonProperty("received")]
+            public long Received { get; set; }
+            [JsonProperty("starttime")]
+            public string Starttime { get; set; }
+            [JsonProperty("error")]
+            public string Error { get; set; }
+        }
+
+        public class SiaDownloadList
+        {
+            [JsonProperty("downloads")]
+            public SiaDownloadFile[] Files { get; set; }
+        }
+
+        private SiaFileList GetFiles()
+        {
+            var fl = new SiaFileList();
+
+            try
+            {
+                string endpoint = string.Format("/renter/files");
+                System.Net.HttpWebRequest req = CreateRequest(endpoint);
+                req.Method = System.Net.WebRequestMethods.Http.Get;
+
+                Utility.AsyncHttpRequest areq = new Utility.AsyncHttpRequest(req);
+
+                using (System.Net.HttpWebResponse resp = (System.Net.HttpWebResponse)areq.GetResponse())
+                {
+                    int code = (int)resp.StatusCode;
+                    if (code < 200 || code >= 300)
+                        throw new System.Net.WebException(resp.StatusDescription, null, System.Net.WebExceptionStatus.ProtocolError, resp);
+
+                    var serializer = new JsonSerializer();
+
+                    using (var rs = areq.GetResponseStream())
+                    using (var sr = new System.IO.StreamReader(rs))
+                    using (var jr = new Newtonsoft.Json.JsonTextReader(sr))
+                    {
+                        fl = (SiaFileList)serializer.Deserialize(jr, typeof(SiaFileList));
+                    }
+                }
+            }
+            catch (System.Net.WebException wex)
+            {
+                throw new Exception("failed to call /renter/files " + wex.Message);
+            }
+            return fl;
+        }
+
+        private bool IsUploadComplete(string siafilename)
+        {
+            SiaFileList fl = GetFiles();
+            foreach (var f in fl.Files)
+            {
+                if (f.Siapath == siafilename)
+                {
+                    if (f.Available == true && f.Redundancy >= m_redundancy && f.Uploadprogress >= 100)
+                    {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+
+        private SiaDownloadList GetDownloads()
+        {
+            var fl = new SiaDownloadList();
+
+            try
+            {
+                string endpoint = string.Format("/renter/downloads");
+                System.Net.HttpWebRequest req = CreateRequest(endpoint);
+                req.Method = System.Net.WebRequestMethods.Http.Get;
+
+                Utility.AsyncHttpRequest areq = new Utility.AsyncHttpRequest(req);
+
+                using (System.Net.HttpWebResponse resp = (System.Net.HttpWebResponse)areq.GetResponse())
+                {
+                    int code = (int)resp.StatusCode;
+                    if (code < 200 || code >= 300)
+                        throw new System.Net.WebException(resp.StatusDescription, null, System.Net.WebExceptionStatus.ProtocolError, resp);
+
+                    var serializer = new JsonSerializer();
+
+                    using (var rs = areq.GetResponseStream())
+                    using (var sr = new System.IO.StreamReader(rs))
+                    using (var jr = new Newtonsoft.Json.JsonTextReader(sr))
+                    {
+                        fl = (SiaDownloadList)serializer.Deserialize(jr, typeof(SiaDownloadList));
+                    }
+                }
+            }
+            catch (System.Net.WebException wex)
+            {
+                throw new Exception("failed to call /renter/downloads " + wex.Message);
+            }
+            return fl;
+        }
+
+        private bool IsDownloadComplete(string siafilename, string localname)
+        {
+            SiaDownloadList fl = GetDownloads();
+            foreach (var f in fl.Files)
+            {
+                if (f.Siapath == siafilename)
+                {
+                    if (f.Error != "")
+                    {
+                        throw new Exception("failed to download " + siafilename + "err: " + f.Error);
+                    }
+                    if (f.Filesize == f.Received)
+                    {
+                        try
+                        {
+                            // Sia seems to keep the file open/locked for a while, make sure we can open it
+                            System.IO.FileStream fs = new System.IO.FileStream(localname, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite);
+                            fs.Close();
+                        }
+                        catch (System.IO.IOException)
+                        {
+                            return false;
+                        }
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+
+        #region IBackend Members
+
+        public void Test()
+        {
+            List();
+        }
+
+        public void CreateFolder()
+        {
+            // Dummy method, Sia doesn't have folders
+        }
+
+        public string DisplayName
+        {
+            get { return Strings.Sia.DisplayName; }
+        }
+
+        public string ProtocolKey
+        {
+            get { return "sia"; }
+        }
+
+         
+        public List<IFileEntry> List()
+        {
+            var files = new List<IFileEntry>();
+            try
+            {
+                SiaFileList fl = GetFiles();
+                foreach (var f in fl.Files)
+                {
+                    // Sia returns a complete file list, but we're only interested in files that are
+                    // in our target path
+                    if (f.Siapath.StartsWith(m_targetpath))
+                    {
+                        FileEntry fe = new FileEntry(f.Siapath.Substring(m_targetpath.Length+1));
+                        fe.Size = f.Filesize;
+                        fe.IsFolder = false; 
+                        files.Add(fe);
+                    }
+                }
+            }
+            catch (System.Net.WebException wex)
+            {
+                throw new Exception("failed to call /renter/files "+wex.Message);
+            }
+
+            return files;
+        }
+
+        public void Put(string remotename, string filename)
+        {
+            string endpoint ="";
+            string siafile = m_targetpath + "/" + remotename;
+
+            try {
+                endpoint = string.Format("/renter/upload/{0}/{1}?source={2}&datapieces=1&paritypieces=12",
+                    m_targetpath, 
+                    Library.Utility.Uri.UrlEncode(remotename).Replace("+", "%20"),
+                    Library.Utility.Uri.UrlEncode(filename).Replace("+", "%20")
+                );
+
+                System.Net.HttpWebRequest req = CreateRequest(endpoint);
+                req.Method = System.Net.WebRequestMethods.Http.Post;
+
+                Utility.AsyncHttpRequest areq = new Utility.AsyncHttpRequest(req);
+
+                using (System.Net.HttpWebResponse resp = (System.Net.HttpWebResponse)areq.GetResponse())
+                {
+                    int code = (int)resp.StatusCode;
+                    if (code < 200 || code >= 300)
+                        throw new System.Net.WebException(resp.StatusDescription, null, System.Net.WebExceptionStatus.ProtocolError, resp);
+
+                    while (! IsUploadComplete( siafile ))
+                    {
+                        System.Threading.Thread.Sleep(5000);
+                    }
+                }
+            }
+            catch (System.Net.WebException wex)
+            {
+                throw new Exception("failed to call " + endpoint + " err " + wex.Message);
+            }
+        }
+
+        public void Get(string remotename, string localname)
+        {
+            string endpoint = "";
+            string siafile = m_targetpath + "/" + remotename;
+            string tmpfilename = localname + ".tmp";
+
+            try
+            {
+                endpoint = string.Format("/renter/download/{0}/{1}?destination={2}",
+                    m_targetpath,
+                    Library.Utility.Uri.UrlEncode(remotename).Replace("+", "%20"),
+                    Library.Utility.Uri.UrlEncode(tmpfilename).Replace("+", "%20")
+                );
+                System.Net.HttpWebRequest req = CreateRequest(endpoint);
+                req.Method = System.Net.WebRequestMethods.Http.Get;
+
+                Utility.AsyncHttpRequest areq = new Utility.AsyncHttpRequest(req);
+
+                using (System.Net.HttpWebResponse resp = (System.Net.HttpWebResponse)areq.GetResponse())
+                {
+                    int code = (int)resp.StatusCode;
+                    if (code < 200 || code >= 300)
+                        throw new System.Net.WebException(resp.StatusDescription, null, System.Net.WebExceptionStatus.ProtocolError, resp);
+
+                    while (!IsDownloadComplete(siafile, localname))
+                    {
+                        System.Threading.Thread.Sleep(5000);
+                    }
+                   
+                    System.IO.File.Copy(tmpfilename, localname, true);
+                    try
+                    {
+                        System.IO.File.Delete(tmpfilename);
+                    } catch (Exception)
+                    {
+
+                    }
+                }
+            }
+            catch (System.Net.WebException wex)
+            {
+                if (wex.Response is System.Net.HttpWebResponse && ((System.Net.HttpWebResponse)wex.Response).StatusCode == System.Net.HttpStatusCode.NotFound)
+                    throw new FileMissingException(wex);
+                else
+                    throw;
+            }
+        }
+
+        public void Delete(string remotename)
+        {
+            string endpoint = "";
+
+            try
+            {
+                endpoint = string.Format("/renter/delete/{0}/{1}",
+                    m_targetpath,
+                    Library.Utility.Uri.UrlEncode(remotename).Replace("+", "%20")
+                );
+                System.Net.HttpWebRequest req = CreateRequest(endpoint);
+                req.Method = System.Net.WebRequestMethods.Http.Post;
+
+                Utility.AsyncHttpRequest areq = new Utility.AsyncHttpRequest(req);
+
+                using (System.Net.HttpWebResponse resp = (System.Net.HttpWebResponse)areq.GetResponse())
+                {
+                    int code = (int)resp.StatusCode;
+                    if (code < 200 || code >= 300)
+                        throw new System.Net.WebException(resp.StatusDescription, null, System.Net.WebExceptionStatus.ProtocolError, resp);
+                }
+            }
+            catch (System.Net.WebException wex)
+            {
+                if (wex.Response is System.Net.HttpWebResponse && ((System.Net.HttpWebResponse)wex.Response).StatusCode == System.Net.HttpStatusCode.NotFound)
+                    throw new FileMissingException(wex);
+                else
+                    throw;
+            }
+        }
+
+
+        public IList<ICommandLineArgument> SupportedCommands
+        {
+            get
+            {
+                return new List<ICommandLineArgument>(new ICommandLineArgument[] {
+                    new CommandLineArgument(SIA_APIHOST, CommandLineArgument.ArgumentType.String, Strings.Sia.SiaHostDescriptionShort, Strings.Sia.SiaHostDescriptionLong, null, new string[] {SIA_APIHOST}, null),
+                    new CommandLineArgument(SIA_PASSWORD, CommandLineArgument.ArgumentType.Password, Strings.Sia.SiaPasswordShort, Strings.Sia.SiaPasswordLong, null, new string[] {SIA_PASSWORD}, null),
+                    new CommandLineArgument(SIA_REDUNDANCY, CommandLineArgument.ArgumentType.String, Strings.Sia.SiaRedundancyDescriptionShort, Strings.Sia.SiaRedundancyDescriptionLong, null, new string[] {SIA_REDUNDANCY}, null),
+                });
+            }
+        }
+
+        public string Description
+        {
+            get
+            {
+                return Strings.Sia.Description;
+            }
+        }
+
+        #endregion
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+
+        }
+
+        #endregion
+
+
+    }
+
+
+}
diff --git a/Duplicati/Library/Backend/Sia/Strings.cs b/Duplicati/Library/Backend/Sia/Strings.cs
new file mode 100644
index 000000000..f127c5d3c
--- /dev/null
+++ b/Duplicati/Library/Backend/Sia/Strings.cs
@@ -0,0 +1,16 @@
+using Duplicati.Library.Localization.Short;
+namespace Duplicati.Library.Backend.Strings
+{
+    internal static class Sia
+    {
+        public static string DisplayName { get { return LC.L(@"SIA Collaborative Cloud"); } }
+        public static string Description { get { return LC.L(@"This backend can read and write data to Sia."); } }
+        public static string SiaHostDescriptionShort { get { return LC.L(@"Sia address"); } }
+        public static string SiaHostDescriptionLong { get { return LC.L(@"Sia address, ie 127.0.0.1:9980"); } }
+        public static string SiaPasswordShort { get { return LC.L(@"Sia password"); } }
+        public static string SiaPasswordLong { get { return LC.L(@"Sia password"); } }
+
+        public static string SiaRedundancyDescriptionShort { get { return LC.L(@"3"); } }
+        public static string SiaRedundancyDescriptionLong { get { return LC.L(@"Minimum value is 3."); } }
+    }
+}
diff --git a/Duplicati/Library/Backend/Sia/packages.config b/Duplicati/Library/Backend/Sia/packages.config
new file mode 100644
index 000000000..a272c64df
--- /dev/null
+++ b/Duplicati/Library/Backend/Sia/packages.config
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Newtonsoft.Json" version="10.0.2" targetFramework="net45" />
+</packages>
\ No newline at end of file
diff --git a/Duplicati/Server/Duplicati.Server.csproj b/Duplicati/Server/Duplicati.Server.csproj
index 08f901e9d..c93052735 100644
--- a/Duplicati/Server/Duplicati.Server.csproj
+++ b/Duplicati/Server/Duplicati.Server.csproj
@@ -5,7 +5,7 @@
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>

     <ProjectGuid>{19E661D2-C5DA-4F35-B3EE-7586E5734B5F}</ProjectGuid>

     <OutputType>Exe</OutputType>

-    <Prefer32Bit>False</Prefer32Bit>    

+    <Prefer32Bit>False</Prefer32Bit>

     <AppDesignerFolder>Properties</AppDesignerFolder>

     <RootNamespace>Duplicati.Server</RootNamespace>

     <AssemblyName>Duplicati.Server</AssemblyName>

@@ -182,6 +182,10 @@
       <Project>{59C8BBC5-6E42-46FB-AB3E-6C183A82459A}</Project>

       <Name>Duplicati.Library.Backend.SharePoint</Name>

     </ProjectReference>

+    <ProjectReference Include="..\Library\Backend\Sia\Duplicati.Library.Backend.Sia.csproj">

+      <Project>{32a74526-3e5f-413a-8cb4-1efdad4c8b91}</Project>

+      <Name>Duplicati.Library.Backend.Sia</Name>

+    </ProjectReference>

     <ProjectReference Include="..\Library\Backend\SSHv2\Duplicati.Library.Backend.SSHv2.csproj">

       <Project>{FF2BF37C-E502-4C98-BEA0-701671DDFA08}</Project>

       <Name>Duplicati.Library.Backend.SSHv2</Name>

diff --git a/Duplicati/Server/webroot/ngax/scripts/services/EditUriBuiltins.js b/Duplicati/Server/webroot/ngax/scripts/services/EditUriBuiltins.js
index 945e61988..91b4a74f9 100644
--- a/Duplicati/Server/webroot/ngax/scripts/services/EditUriBuiltins.js
+++ b/Duplicati/Server/webroot/ngax/scripts/services/EditUriBuiltins.js
@@ -25,7 +25,8 @@ backupApp.service('EditUriBuiltins', function(AppService, AppUtils, SystemInfo,
     EditUriBackendConfig.templates['mega']        = 'templates/backends/mega.html';
     EditUriBackendConfig.templates['jottacloud']  = 'templates/backends/jottacloud.html';
     EditUriBackendConfig.templates['box']         = 'templates/backends/oauth.html';
-    EditUriBackendConfig.templates['dropbox']     = 'templates/backends/oauth.html';
+    EditUriBackendConfig.templates['dropbox'] = 'templates/backends/oauth.html';
+    EditUriBackendConfig.templates['sia']       = 'templates/backends/sia.html';
 
 
     EditUriBackendConfig.testers['s3'] = function(scope, callback) {
@@ -360,6 +361,19 @@ backupApp.service('EditUriBuiltins', function(AppService, AppUtils, SystemInfo,
         EditUriBackendConfig.mergeServerAndPath(scope);
     };
 
+    EditUriBackendConfig.parsers['sia'] = function (scope, module, server, port, path, options) {
+        if (options['--sia-targetpath'])
+            scope.Path = options['--sia-target-path'];
+        if (options['--sia-redundancy'])
+            scope.sia_redundancy = options['--sia-redundancy'];
+        if (options['--sia-password'])
+            scope.Password = options['--sia-password'];
+
+        var nukeopts = ['--sia-targetpath', '--sia-redundancy', '--sia-password'];
+        for (var x in nukeopts)
+            delete options[nukeopts[x]];
+    };
+
     // Builders take the scope and produce the uri output
     EditUriBackendConfig.builders['s3'] = function(scope) {
         var opts = {
@@ -524,7 +538,21 @@ backupApp.service('EditUriBuiltins', function(AppService, AppUtils, SystemInfo,
         return url;
     };
 
-    EditUriBackendConfig.builders['jottacloud'] = function(scope) {
+    EditUriBackendConfig.builders['sia'] = function (scope) {
+        var opts = {};
+        EditUriBackendConfig.merge_in_advanced_options(scope, opts);
+
+        var url = AppUtils.format('{0}://{1}/{2}{3}',
+            scope.Backend.Key,
+            scope.Server || '',
+            scope.Path || '',
+            AppUtils.encodeDictAsUrl(opts)
+        );
+
+        return url;
+    }
+
+    EditUriBackendConfig.builders['jottacloud'] = function (scope) {
         var opts = { };
 
         EditUriBackendConfig.merge_in_advanced_options(scope, opts);
@@ -729,5 +757,16 @@ backupApp.service('EditUriBuiltins', function(AppService, AppUtils, SystemInfo,
             continuation();
     };
 
+    EditUriBackendConfig.validaters['sia'] = function (scope, continuation) {
+        var res =
+            EditUriBackendConfig.require_field(scope, 'Server', gettextCatalog.getString('Server'));
+
+        if (res && (scope['sia_redundancy'] || '').trim().length == 0 || parseInt(scope['sia_redundancy']) < 3)
+            res = EditUriBackendConfig.show_error_dialog(gettextCatalog.getString('Minimum redundancy is 3'));
+
+        if (res)
+            continuation();
+    };
+
 
 });
diff --git a/Duplicati/Server/webroot/ngax/scripts/services/SystemInfo.js b/Duplicati/Server/webroot/ngax/scripts/services/SystemInfo.js
index dc7467689..4e1bfb741 100644
--- a/Duplicati/Server/webroot/ngax/scripts/services/SystemInfo.js
+++ b/Duplicati/Server/webroot/ngax/scripts/services/SystemInfo.js
@@ -68,6 +68,7 @@ backupApp.service('SystemInfo', function($rootScope, $timeout, $cookies, AppServ
                 'od4b': null,
                 'mssp': null,
                 'dropbox': null,
+                'sia': null,
                 'jottacloud': null
             }
         };
diff --git a/Duplicati/Server/webroot/ngax/templates/backends/sia.html b/Duplicati/Server/webroot/ngax/templates/backends/sia.html
new file mode 100644
index 000000000..acf415386
--- /dev/null
+++ b/Duplicati/Server/webroot/ngax/templates/backends/sia.html
@@ -0,0 +1,16 @@
+<div class="input text">
+    <label for="sia_server" translate>Server</label>
+    <input type="text" id="sia_server" ng-model="$parent.Server" placeholder="{{'127.0.0.1:9980'}}" />
+</div>
+<div class="input text">
+    <label for="sia_path" translate>Folder path</label>
+    <input type="text" name="sia_targetpath" id="sia_targetpath" ng-model="$parent.Path" placeholder="{{'Target path, ie /backup' | translate}}" />
+</div>
+<div class="input password">
+    <label for="sia_password" translate>Server password</label>
+    <input type="password" name="sia_password" id="sia_password" ng-model="$parent.Password" placeholder="{{'Sia server password' | translate}}" />
+</div>
+<div class="input text">
+    <label for="sia_redundancy" translate>Minimum redundancy</label>
+    <input type="text" name="sia_redundancy" id="sia_redundancy" ng-model="$parent.sia_redundancy" placeholder="{{'3'}}" />
+</div>