The workaround was to back everything up to the "Google Drive" folder since this seems to be the only folder that Backup and Sync can actually restore.
The workaround was to back everything up to the "Google Drive" folder since this seems to be the only folder that Backup and Sync can actually restore.
At one point I set it up to use my second SSD as the local storage. Then I needed that SSD elsewhere, so I just took it out. It was impossible to restart the damn thing. It kept complaining about missing folders. I even tried uninstalling and reinstalling it, but it kept its settings.
Since I barely used that machine, if ever, and I'm not particularly familiar with Windows, I never really looked into how to completely clean up the configuration. But the point is that there clearly are some pretty stupid decisions about some products.
System-wide settings and state should be stored in C:\ProgramData.
But on a more useful note how I have handled this in the past is to download the complete Google Drive data using Google Takeout. Not the greatest solution but it has worked.