homeserver-backup is a private tool used only by members of one household to back up their own Google accounts.
Read-only access to Google Drive (drive.readonly), granted by each account owner. It cannot change or delete anything in Google Drive.
Files are copied to storage owned and controlled by the household, for backup and restore only. Nothing is sold, shared with third parties, used for advertising, or used to train models.
Access can be withdrawn at any time at myaccount.google.com/permissions.
Use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.