Or use duplicity. It even directly supports many cloud-services as backend, including Google Drive ($2 for 100GB, $10 for 1TB) Dropbox, Onedrive, etc. It encrypts, deduplicates, stores old versions, etc.
I'd much rather trust my backups to tarsnap, which is not in beta. Furthermore, and perhaps even more importantly, tarsnap offers support which duplicity does not. When my hard drives decide to die, I really want someone who I can contact if there are any issues restoring from backups.