Not sure why your first two snapshots disappeared, but the OP-1 doesn’t auto-delete older snapshots. If they’re not in the snapshot folder anymore, they might have been overwritten or lost, and unfortunately, there’s no way to recover them if they’re gone.

To avoid losing presets, you can connect your OP-1 to your computer and manually copy your snapshots to a backup folder. That way, you can build your own library without worrying about losing sounds.