There's a few groups like this in Australia, unfortunately.
Australia didn't even have an R18+ rating for games until 2013 (R18+ is similar to AO or NC-17 in the USA). Before then, all games with a higher rating than MA15+ were illegal in Australia. Many games had an Australia-specific version with blood/gore reduced, some things edited out, etc. to reduce the rating. The original release of GTA4 in Australia was heavily censored.
In addition to backups, consider using snapshots if your file system supports it (ZFS, Btrfs, or LVM).
I use ZFS and have each of my Docker volumes in a separate ZFS dataset (similar to a Btrfs subvolume). This lets me snapshot each container independently. I take a snapshot before an upgrade. If the upgrade goes badly, I can instantly revert back to the point before I performed the upgrade.