For Google Drive files, you don't need a special account or service to back up to Synology and B2, which I also do. I use the Synology Cloud Sync service to automatically sync all Google Drive files to the synology, then another Cloud Sync task to backup the Synology to B2. Works great.
Synology is indeed great, but CubeBackup is a nice alternative for me as it runs on a VPS. I’m often away from home for long periods due to business travel, and I like being able to remotely keep the backups working even if the NAS goes down or is turned off.
