An Incremental backup will back up any files that have changed since the last backup taken (regardless of whether this previous backup is full or incremental) A differential backup will back up ALL files changed since the last full backup. So, if you need to restore a file using an incremental backup routine, you potential require all tapes since your last full backup. If you use a differential backup routine, you will only require the full backup tape plus the last differantil backup tape.

An Incremental backup will back up any files that have changed since the last backup taken (regardless of whether this previous backup is full or incremental) A differential backup will back up ALL files changed since the last full backup. So, if you need to restore a file using an incremental backup routine, you potential require all tapes since your last full backup. If you use a differential backup routine, you will only require the full backup tape plus the last differantil backup tape.