Table of contents : You Want to Learn About Disk-Based BackupWhy Back Up? What Will Downtime Cost You? Wax On, Wax Off: Finding a Balance Get the Coverage That You Need Why the Word "Volume" Instead of "Tape"? 2. Backing It All Up Deciding Why You Are Backing Up Deciding What to Back Up Take an Inventory Are You Backing Up What You Think You're Backing Up? Back Up All or Part of the System? Backing up the entire system Deciding When to Back Up Which Levels.