More than any other piece of self-hosted software: backups are important if you’re going to host a password manager.
I have Borg automatically backing up most of the data on my server, but around once every 3 months or so, I take a backup of Vaultwardens data and put it on an external drive.
As long as you can keep up with that, or a similar process; there’s little concern to me about screwing things up. I’m constantly making tweaks and changes to my server setup, but, should I royally fuck up and say, corrupt all my data somehow: I’ve got a separate backup of the absolutely critical stuff and can easily rebuild.
But, even with the server destroyed and all backups lost, as long as you still have a device that’s previously logged into your password manager; you can unlock it and export the passwords to manually recover.
I seems IANA would like to not repeat past mistakes.