I use vaultwarden as my bitwarden backup. I pay for bitwarden premium because it’s too critical of a service for me to not pay for access/support the service, or to expect my self hosted option will be sufficiently reliable enough.

That said, as a backup option, I run the vaultwarden addon in home assistant and just periodically do a manual export from bitwarden and import to vaultwarden. This is usually good enough for me, but glad to see this thread with some other options. Will be exploring some of these too!

I run it through an nginx proxy that runs cloudflared through my domain, giving https access with limited worry of various security concerns. Probably not the best setup but was relatively easy to do.