A RAID 'fixes itself': basically, if one of two drives fails, the other takes over. At that point the RAID is 'degraded' and cannot absorb another failure until it's repaired with a new drive (at which point it 're-syncs').
I use RAID drives are the destination of my backups to give myself additional protection. I also use a RAID as my startup drive, and one that stores my critical data. In fact, nearly everything of importance is both stored natively and backed up on RAID devices for protection.
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--Dave Nanian
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