

Almost there:
- You and your wifes phones -> YES
- A shared laptop with two accounts -> YES
- A server running FBQ and or syncthing? -> NO, currently only Syncthing but was considering FBQ to solve the sharing bit.
Although I think I get what you are saying. I think Syncthing can be setup to keep backup copies but not exactly the same as versioning I guess. Maybe I just have to go back to something more similar to Nextcloud but that is not Nextcloud like OwnCloud Infinite Scale or Opencloud.
I have thought about Vaultwarden but is it still the de facto oos solution? I read that people aren’t very happy with it