I've studied and reread the manual and read and reread the posts on this forum and still I don't understand the difference between a differential and an incremental backup. Maybe I'm a bit slow witted but will someone please explain just what is saved in each of these types? I THINK an incremental saves in each increment only what was added to the file since the last increment, so you need the original full backup and all of the increments to do a restore. I THINK a differential saves in each backup all changes since the original full backup, so you need only the full backup and the latest diff backup file. If that is so, why would anyone bother doing incremental backups, which take up so much more disk space?