Computers to save by default.?

My computer is configured to automatically back up files (Windows Vista Home Premium), which makes normally without any problems, but this time he keeps starting, then I get an error message saying that the last backup error code 0×80070005, can someone tell me how to solve this problem? (I looked on the Microsoft website, but could not find anything useful there), thanks.

Probably lack of memory ….. Not advisable to use it, not backup your personal files, photos, music, videos, etc, that's it, you might as well copy your files a CD / DVD as backup