Hi Emanuele
Here are some suggestions in order to help you with the problem:
Several causes exist for these messages:
- Hard drive problems, such as file system errors or bad sectors
To prevent this problem, make sure that you check the option "Ignore bad sectors during copy" while the Backup Wizard is in process.
- Multiple USB devices that are connected to the computer
Disconnect all devices except for the USB destination hard drive.
Mr Fabietto
http://fcerullo.spaces.live.com/