Copying files has the disadvantage of requiring some merge mechanism, or not permitting parallel modification.

I found vaultwarden to be a nice alternative. It runs on my server at home, to which I connect the relevant devices by VPN. It still requires the server to be online for modification (& the VPN connected), which I find to be a bit annoying, but it solves the concurrent modification issue. Plus, passwords are encrypted at rest and the browser extension verifies I'm using the password on a legitimate website (anti-phishing).

But if you're happy with your variant, I guess that's fine as well :)