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diff --git a/apps/files_versions/lib/Versions/IVersionBackend.php b/apps/files_versions/lib/Versions/IVersionBackend.php
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+++ b/apps/files_versions/lib/Versions/IVersionBackend.php
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+<?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 OCP\Files\File;
+use OCP\Files\FileInfo;
+use OCP\Files\NotFoundException;
+use OCP\Files\SimpleFS\ISimpleFile;
+use OCP\IUser;
+
+/**
+ * @since 15.0.0
+ */
+interface IVersionBackend {
+	/**
+	 * Get all versions for a file
+	 *
+	 * @param IUser $user
+	 * @param FileInfo $file
+	 * @return IVersion[]
+	 * @since 15.0.0
+	 */
+	public function getVersionsForFile(IUser $user, FileInfo $file): array;
+
+	/**
+	 * Create a new version for a file
+	 *
+	 * @param IUser $user
+	 * @param FileInfo $file
+	 * @since 15.0.0
+	 */
+	public function createVersion(IUser $user, FileInfo $file);
+
+	/**
+	 * Restore this version
+	 *
+	 * @param IVersion $version
+	 * @since 15.0.0
+	 */
+	public function rollback(IVersion $version);
+
+	/**
+	 * Open the file for reading
+	 *
+	 * @param IVersion $version
+	 * @return resource
+	 * @throws NotFoundException
+	 * @since 15.0.0
+	 */
+	public function read(IVersion $version);
+
+	/**
+	 * Get the preview for a specific version of a file
+	 *
+	 * @param IUser $user
+	 * @param FileInfo $sourceFile
+	 * @param int $revision
+	 * @return ISimpleFile
+	 * @since 15.0.0
+	 */
+	public function getVersionFile(IUser $user, FileInfo $sourceFile, int $revision): File;
+}