@mcread @charliebrownau I've been using KeePass 2.x format and various compatible apps, for years. KeePass supports any kind of "sync this folder to that folder" tooling you might use, and its log-structured database format supports easy merging in the case of file-level sync conflicts.
KeePassXC (and some other front-ends) support putting all of your TOTP ("Google Authenticator") codes into your password database, so you're not fucked by a lost phone, and all of your devices can have them.