Why isn’t RAID a backup?

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Tags:
Backup
RAID
I apologize if this is a dumb question but I was having a conversation with my friend about backups and he told me that RAID is not a backup. Is that true? What would be the difference between redundancy and a backup? Thanks!
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A complete RAID set can fail for many different reasons. Also, data can be deleted with or without intention.  If something like that happens you have no way to restore the information, unless you have a real backup.

So, if the information is important and you want to have some fault tolerance for continuous access to it, you need both, redundancy and backups.

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  • TheRealRaven
    RAID refers to 'R'edundancy aspects of the disk drives rather than redundancy of data objects stored on the disks. (Some RAID formats do involve duplicates of data objects.)

    A significant difference between RAID and 'backup' is that (possibly accidentally) deleting a file from a RAID configuration causes the file to be gone even if it was duplicated, while deleting a file that has been "backed up" leaves the backup copy intact.
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  • TheRealRaven
    ...that is, "even if it was duplicated by RAID mirroring or other RAID means". (Why isn't there some way to edit comments?)
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