You’ll be wanting sudo ostree admin pin 1 seeing as 0 was broken. Double check with rpm-ostree status.

Proceed to rpm-ostree update, if that does nothing it means 0 is up to date, personally I’d just wait for a new update using the working deployment, but you can blow away 0 and get it again if you’re keen.

Basically, you want to shut down the database before backing up. Otherwise, your backup might be mid-transaction, i.e. broken. If it’s docker you can just docker-compose down it, backup, and then docker-compose up, or equivalent.