Nice tutorial! I just created a Windows VM and use regular Backblaze (unlimited storage, $50 a year) client on it to back my stuff up. Map a drive(s) to the share(s) necessary on your unRAID box via a service account (so the Backblaze client will be able to process them like a system drive), selected what i wanted to back up, done.
Backups, restores, etc, all easy peasy, even from the Backblaze web interface.