Have you ever tried to restore files that were backed with older tape drives or software versions? Most likely you can't. This is because most systems require you to restore with the same software version and tape format that made the backup. If you have upgraded your tape software or tape drive, you probably cannot restore your older backups. The PKZIP compressed storage format is time proven. It has been around for many years and is now built-in to operating systems like Windows XP and Vista. This ensures you will be able to access your files for many years to come.