I’ve put Vaultwarden online and have configured it to backup over the network through duplicity. Updates are automatic (I have a cronjob that just does docker pull/stop/rm/run without checking the error codes). No downtime so far!
It’s been a while since I’ve used the official Bitwarden server, but Vaultwarden is pretty much foolproof. It’s one of the easiest programs to self-host that I’ve come across.