High availability Bitwarden Setup -- how would I set this up?

I know a lot of the users in the forums of networking gurus.

I currently have a self-hosted bitwarden_rs server running within VM. External access is from OpenVPN.

What should I be looking towards if I wanted to implement a “high availability” setup? If I had a backup bitwarden_rs server configured on a VPS, what method would be used to synchronize the databases?