[sciurius]

Yes, I would assume that upon program start a sort of snapshot is made that contains global settings and song metadata.
In the settings pane (under Backup and Restore, maybe?), a section "Snapshots".

- [X] Automatically create snapshot upon program start
- [Button] Create snapshot
- [Button] Restore last snapshot (show its date/time)

Deluxe:

- Number of snapshots to retain (e.g., 4, or 16).
- Restore last snapshot has a checkbox "remove after restore".

The Deluxe version makes it possible to repeatedly restore a snapshot. When multiple shapshots are kept, and the last one is restored with remove, the second last becomes the next candidate for restore.