DISK-TO-DISK BACKUP

Disk-to-disk backups are an efficient method of improving one's backup architecture. Disk backups save time because disks are a random access device while tape media are sequential. If you write mulitiple data streams to a tape device the data is mixed together on the tape media. When it comes time to do a restore you have to read all of the data (not just the data that needs to be restored.) Restores from disk are much faster because disk drives are random access by nature. By adding a disk stage to your backup system, you also can eliminate duplicate tape backups by implementing incremental disk backups. Since incremental backups are online in a disk data vault, a full server rebuild from a full backup and several incremental backups doesn't take too long.