Backup SQL Server to Google Drive
Download the Google Drive desktop application.
When backing up SQL Server, set the destination to the "My Drive" folder created by Google Drive (something like C:\Users\&lt;user&gt;\Google Drive by default)
Once a backup is placed in that folder, it will automatically start to sync to Google Drive. 


Also worth nothing, as per Shawn Melton's comment:

You can adjust the folder location for the drive application, so it does not have to reside in a user folder. Any Administrator can actually remove a user profile and you just lost all your backups (locally at least).