Add Full system backup feature (#13945)

MediaBrowser.Controller/SystemBackupService/BackupRestoreRequestDto.cs

@@ -0,0 +1,15 @@
+using System;
+using MediaBrowser.Common.Configuration;
+
+namespace MediaBrowser.Controller.SystemBackupService;
+
+/// <summary>
+/// Defines properties used to start a restore process.
+/// </summary>
+public class BackupRestoreRequestDto
+{
+    /// <summary>
+    /// Gets or Sets the name of the backup archive to restore from. Must be present in <see cref="IApplicationPaths.BackupPath"/>.
+    /// </summary>
+    public required string ArchiveFileName { get; set; }
+}