Use whatever you want for sharing your database across devices, like Syncthing or Nextcloud (or even USB thumb drives), as long as you have a strong password for it (or other means of unlocking it) and it should alleviate many of the availability related complaints about file based secret management.

It even allows storing files (like SSH keys) and on some platforms has the possibility of typing your credentials for you so they don't end up in the clipboard, even though when you use the clipboard functionality they get cleared out of it after a little bit.