I don't have version 5 installed, so I can't look it up for you. You might have to restore from DOS. Poke around the user manual
. But be careful. Make sure restoring doesn't wipe out anything added to your disk since backing up. Nero's restore utility may insist on restoring everything in the backup whether you want it or not (i.e. you may not be able to restore just one file).
People have had trouble with Nero's backup utilities before. I personally prefer to simply copy my files in uncompressed form to regular data CDs. In any event and whatever you decide to use, make sure you understand and can use your backup/restore program/procedures before committing your valuable data to backup and (intentionally or unintentionally) erasing it from your hard drive.