I made a dvd backup from mine files, after two days and 70 dvd's their was in the night a restart from windows for a update. And olso on the 56 dvd their was a problem with a dvd. When I take him out I see that the disk is defect. Their was I think 5 disk before finish the backup. Can I do somthing or have I start al over again. 70 dvd and a lot of work are gone then.