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diff --git a/apps/files_versions/lib/Versions/LegacyVersionsBackend.php b/apps/files_versions/lib/Versions/LegacyVersionsBackend.php
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+++ b/apps/files_versions/lib/Versions/LegacyVersionsBackend.php
@@ -0,0 +1,105 @@
+<?php declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\Files_Versions\Versions;
+
+use OC\Files\View;
+use OCA\Files_Versions\Storage;
+use OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\Files\NotFoundException;
+use OCP\IUser;
+
+class LegacyVersionsBackend implements IVersionBackend {
+	/** @var IRootFolder */
+	private $rootFolder;
+
+	public function __construct(IRootFolder $rootFolder) {
+		$this->rootFolder = $rootFolder;
+	}
+
+	public function getVersionsForFile(IUser $user, FileInfo $file): array {
+		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
+		$versions = Storage::getVersions($user->getUID(), $userFolder->getRelativePath($file->getPath()));
+
+		return array_map(function (array $data) use ($file, $user) {
+			return new Version(
+				(int)$data['version'],
+				(int)$data['version'],
+				$data['name'],
+				(int)$data['size'],
+				$data['mimetype'],
+				$data['path'],
+				$file,
+				$this,
+				$user
+			);
+		}, $versions);
+	}
+
+	public function createVersion(IUser $user, FileInfo $file) {
+		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
+		$relativePath = $userFolder->getRelativePath($file->getPath());
+		$userView = new View('/' . $user->getUID());
+		// create all parent folders
+		Storage::createMissingDirectories($relativePath, $userView);
+
+		Storage::scheduleExpire($user->getUID(), $relativePath);
+
+		// store a new version of a file
+		$userView->copy('files/' . $relativePath, 'files_versions/' . $relativePath . '.v' . $file->getMtime());
+		// ensure the file is scanned
+		$userView->getFileInfo('files_versions/' . $relativePath . '.v' . $file->getMtime());
+	}
+
+	public function rollback(IVersion $version) {
+		return Storage::rollback($version->getVersionPath(), $version->getRevisionId());
+	}
+
+	private function getVersionFolder(IUser $user): Folder {
+		$userRoot = $this->rootFolder->getUserFolder($user->getUID())
+			->getParent();
+		try {
+			/** @var Folder $folder */
+			$folder = $userRoot->get('files_versions');
+			return $folder;
+		} catch (NotFoundException $e) {
+			return $userRoot->newFolder('files_versions');
+		}
+	}
+
+	public function read(IVersion $version) {
+		$versions = $this->getVersionFolder($version->getUser());
+		/** @var File $file */
+		$file = $versions->get($version->getVersionPath() . '.v' . $version->getRevisionId());
+		return $file->fopen('r');
+	}
+
+	public function getVersionFile(IUser $user, FileInfo $sourceFile, int $revision): File {
+		$userFolder = $this->rootFolder->getUserFolder($user->getUID());
+		$versionFolder = $this->getVersionFolder($user);
+		/** @var File $file */
+		$file = $versionFolder->get($userFolder->getRelativePath($sourceFile->getPath()) . '.v' . $revision);
+		return $file;
+	}
+}