I see no one has answered, I can't help you either. But, I can tell you I had trouble with Cobian also. Never could get it to work right.
I finally decided to get Acronis
and I have had very good luck with it. It's easy to use and does a backup quickly. I back up to an external HD and I can go onto it, open up the backup file, find individual files and restore them.
Sorry I couldn't help you with Cobian, but if you get fed up, check out Acronis.