You should only have to backup the Postgres database. But it won’t hurt to have a copy of your compose file as well.
This GitHub issue has the steps you should use. And answers all your other questions too.
Great thanks! (also thanks to Mike .. you have some valid points)
First of all, thanks to all who replied! I didn't think there would have been that many people who self-host a SSO-server, so I am happy to see these replies.
As a side-note, I have also been looking into making the setup more robust, i.e. add redundancy. For a "light redundant" senario (not fully automatic, but -say- where I have a 2nd instance ready to run, so I just need to adapt the DNS-record if it is needed), can I conclude from the "makeing a backup" question, that I just need to run a 2nd instance of postgres and do streaming-replication from the main instance to the backup-instance ?
Or are there other caviats I haven't thought about?
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