I suggest you get away from the Windows backup program and get yourself a good commercial backup program. This forum is fraught with problem reports for the Windows one. I know I was very unimpressed when I tried it. Three I'm familiar with and like are Norton Ghost (which I've been using for 8 years without the 1st problem), Easeus Todo Backup Free, which you can download from http://www.todo-backup.com/products/home/free-backup-software.htm and Memeo which has a 30 day free trial and you can buy it for $29.99 - you can download it from http://memeo.com . You can get Ghost for next to nothing (like I did) if you watch the sales.
The March 2012 issue of PC World was very high on the FREE program from Easeus, and I've been testing it lately in a variety of configurations; and have to say I'm very impressed. Like Ghost it will back up to a networked drive, and it will create a boot CD for when your PC won't boot. See PC World's review at
CNET has a lot of backup program reviews at
Some of these are free (last time I checked there were over 300), some have free trials (over 1000), and some are purchase only (over 200).
External hard drives are best for backup. You can get a 500 GB one for around $70 and a 1.5 TB one for around $90. You can also buy a 16 GB flash drive for as little as $10. It's the best insurance you can ever buy!
I hope this helps. Good luck
I have tried to backup my computer to a USB external hard drive. Have done it in the past, but now get the 0x80070005 error. Looked at the files actually saved and originally there were over 25 different compressed files. Now it gets to about 11 files and quits with a failure message?? Help please