Does it not recognize the shares at all? I never used this service., but if it goes through yrou computer and you have your shares mapped,it shuold be able to see it. maybe? not elegant but …or back up to external USB drive and connect that drive to pc when you want to back up to backblaze.
Alternatively check these. There are reviews and explanation.
http://www.bestbackups.com/blog/5044/top-5-cloud-backups-nas/
