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 I agree. I'd probably go with something along the lines of ""RAID 1 (mirrored settings/disks) provides redundancy for existing data in situations where up to n-1 disks can fail without loss of data"" or something along those lines. 
 I have seen some text books list RAID 1 as a ""backup solution"", but agreed - I don't think it should be written to seem like a backup solution. 
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