Bitwarden lite self-host deployment, formerly unified, is now generally available! This self-host option is a more lightweight and flexible deployment alternative, ideal for homelab enthusiasts and community members who want to get started quickly with self-hosting Bitwarden. With the release of general availability, Bitwarden lite users can benefit from enhanced performance and reliability.
Seems to be an official alternative to Vaultwarden
Probably worth storing the key in another place as well, like keepass on your phone or just print it out on paper and store it.