A personal home-server backup tool.
Clowder backup is a private tool that copies the files from my own home server to my own Google Drive every night, encrypted, so a failed disk can't take them with it. It is built and used by one person, Jason Teo, for his own data. It is not offered to anyone else and has no accounts, sign-up or public features.
The only thing it asks of Google is permission to create and manage its own backup folder in the owner's Drive (the drive.file scope). It cannot see any other file in that Drive.