True, that thread has gotten very long. It takes me quite a while to scroll to the bottom.
The addon will make a persistent notification when backups are stale (like the ones you get for “failed login attempts”). It also exposes a binary_sensor.backups_stale that is ‘on’ when backups run into trouble for a while. Both of these things can be turned off in the settings. I have a little more guidance and some examples for that here.
If you go to “Actions” > “Reauthorize Google Drive” in the addon you can click the link at the bottom to use your own credentials, you’ll get instructions for how to authenticate with Google Drive in a way that avoids using the domain I host to make it easy (http://habackup.io). Its different from how OPNsense does it. Instructions are here, and here is my best attempt at being transparent about how the addon handles authentication with Google Drive if you’re curious.