Added backups of all data, restorable on another computer (#1008)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/DataBackup/DataBackupManifestReadResult.cs

@@ -0,0 +1,8 @@
+namespace AIStudio.Tools.DataBackup;
+
+/// <summary>
+/// The manifest of a backup, or why it could not be read.
+/// </summary>
+/// <param name="Manifest">The manifest, or null when the backup cannot be used.</param>
+/// <param name="Issue">Why the backup cannot be used, for the user. Empty when it can.</param>
+public sealed record DataBackupManifestReadResult(DataBackupManifest? Manifest, string Issue);