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  • Why is RAID not a backup?

     Joseph updated 10 months, 3 weeks ago 2 Members · 2 Posts
  • Kiran

    August 21, 2020 at 2:52 pm

    When someone mentions RAID in a conversation about backups, invariably someone declares that “RAID is not a backup.”

    Sure, for striping, that’s true. But what’s the difference between redundancy and a backup?

  • Joseph

    August 21, 2020 at 3:16 pm

    RAID guards against one kind of hardware failure. There’s lots of failure modes that it doesn’t guard against.

    • File corruption
    • Human error (deleting files by mistake)
    • Catastrophic damage (someone dumps water onto the server)
    • Viruses and other malware
    • Software bugs that wipe out data
    • Hardware problems that wipe out data or cause hardware damage (controller malfunctions, firmware bugs, voltage spikes)
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