I generally agree with the analysis given so far in this thread,  but let me point out:

> ...and if data will not be backed up elsewhere, consider RAID mirroring hard disks. ...

If you accidentally delete all of last week's work on one mirrored drive, it is immediately gone from the other drive.  Mirroring does guard against hardware errors but not wetware errors.  I'd suggest backing up anything that's of importance to you.

-- Mike
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