Backup of overwritten catalogs #31
Description
In order to avoid unfortunate data loss when overwriting .pouet catalogs, it would be good to backup these catalogs in a backup folder.
- let the user decide of the backup location, either from settings.cfg or directly from the config panel (default must be in the cats directory)
- add a time signature to each backup
- keep by default only a limited number of backups (10?) - can be augmented by the user.