After auth, it downloads a copy of your vaults to your device from their servers.
Super contrived, but you could probably just copy the sqlite dbs of your vault it creates locally to another PC along with the 1Password installer and it might let you sign in with just your master key.
Super contrived, but you could probably just copy the sqlite dbs of your vault it creates locally to another PC along with the 1Password installer and it might let you sign in with just your master key.