D-Link Forums
The Graveyard - Products No Longer Supported => D-Link Storage => DNS-321 => Topic started by: JavaLawyer on February 06, 2013, 09:10:25 AM
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Contrary to popular belief, RAID-1 is not an acceptable backup strategy for storing data
Why RAID-1 is NOT a Backup
- A virus infecting one volume will infect the mirror in real time [may result in a 100% data loss]
- Files accidentally deleted from one volume are deleted from the mirror in real time [may result in 100% loss of deleted data]*
- A RAID-1 array may become corrupted (as may any data storage) [may result in a 100% data loss]
- The ShareCenter containing the RAID may be physically damaged [may result in a 100% data loss]
Separate Physical Backup
- If a virus infects the primary storage, the backup volume is safe [0% data loss]*
- Files accidentally deleted from the primary storage are not immediately deleted from the backup [0% data loss]*
- If the primary storage becomes corrupted, the backup is safe [0% data loss]
- If the primary storage device is physically damaged, the backup is safe [0% data loss]
* Note: If a scheduled backup completes after an accidental data deletion or virus infection, it is possible that deletions/virus will propagate to the backup depending on how the backup software is configured and on whether the virus is detected prior performing the backup job.