I’ve updated by mistake, then reverted the docker image version, the datastore (thanks to the tiered snapshots) and other docker volumes (tbh, not sure about them). I then had an issue with the UI being a bit off and wasn’t able to authenticate from time to time. But it looked ok in the other browsers. Clearing the cache didn’t resolve it. It was back to normal after a few weeks.
I’m not a PBS specialist (running it just for a couple of months, as you could guess), but aiui, if you somehow messed up your instance but not the backups themselves, you can just spin up a new instance and then pull all backups with a sync job. Not sure whether it’s the best way to do it. Better ask on the Proxmox forums.
Well, I actually don’t know why this is that bad. I can come up with some cons for sure.
I think there is some non-trivial benefit in using docker compose files. Their authors are (usually) familiar with the deployed system, so they have different bind mounts/volumes. And then you can decide/guess which storage you should use.