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[K12OSN] why RAID?



I see a lot of posts here asking about setting up a RAID system.  My ignorance and inexperience will no doubt show through here, but why is it so important to get RAID set up?  Why not just have a cron job that makes a copy of /home or any other important directories?  It could be set to run every night, or even after every class period.  It could be set with a low priority via the "nice" command so that it doesn't interfere much with the read/write operations of users who are currently logged in.

Is this a bad idea?  

-Rob

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