On 3 Sep 2010 17:41:48 -0700, cfmpub...@ns.sympatico.ca (Clark Morris)
wrote:

>>Mirroring will happily duplicate bad data written by a misbehaving 
>>program (or by misbehaving hardware for that matter).
>
>And a backup program will blithely copy bad data to the backup
>mechanism. 

Sure, but we can go back to a back-up taken *before* the screw-up,
provided we know about the screw-up in time.

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