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Vol. 2 No. 1 March 2003

How to do hybrid backup

Traditionally, backups have been usually targeted to tape drives, but more and more disk storage is being incorporated into the backup process. One common approach with disk-based backups is using disk as a staging area before copying data to tape, which is known as a two-stage backup architecture. Other strategies include using disk as a complete replacement for tape media. Data is archived to disk in the form of virtual copies (space-saving snapshots) or full volume, byte-for-byte copies. Often hosts will have their disk backups stored on one or two dedicated disk arrays exclusively used for backup storage. Another backup approach balances the mix of disk and tape for data protection. Instead of implementing a two-stage backup, disk and tape are both used as archival media and are incorporated into the tape rotation and retention schedule. For example, instead of using tape solely as the backup medium, disk is substituted to store and age incrementals, allocating tape exclusively for full backups. Disk backups have many ...

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