Sorry, but I sincerely hope you just don’t selfhost Vaultwarden.
Are you saying this because i dont know much about firewalls and VPNs right now? Or because i dont have a good backup solution? Or something else?
Currently my backup solution might not be the nicest, but im taking regular backups on the same laptop, copying those onto an external HD, and syncing that onto my main PC, hopefully whoch should be enough