One simple way is to keep only a few days / weeks of (immutable) keys backups. You can always stop the deletion of you have a big issue. If the law says you hav

One simple way is to keep only a few days / weeks of (immutable) keys backups. You can always stop the deletion of you have a big issue. If the law says you have 14 days to delete all data, you keep only that much backups.