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/DataBackupManifestEntry.cs

@@ -0,0 +1,9 @@
+namespace AIStudio.Tools.DataBackup;
+
+/// <summary>
+/// One file of a backup, as the manifest lists it.
+/// </summary>
+/// <param name="Name">The name of the entry within the backup.</param>
+/// <param name="Size">The size of the file in bytes.</param>
+/// <param name="Sha256">The SHA-256 hash of the file, in lowercase hex digits.</param>
+public sealed record DataBackupManifestEntry(string Name, long Size, string Sha256);