Quoting Ian C. Sison ([EMAIL PROTECTED]):

> Tape backup is unnecassary if you have RAID1 and you regularly switch your
> mirror disk.

It's a super-effective way of doing a limited number of generations of
backups.  (Small disadvantage is that your array is vulnerable during
the rebuild cycle, but only new data would be at risk.)

One drawback might be relative expense.  If you're _serious_ about
backup, and have a proper rotational backup schedule in mind, your cost
of "media" (mirror disks used as backups) might be too high compared to
more-conventional alternatives.  If you're contemplating only two or
three generations of snapshots, then you're not serious.   

Don't forget, too, that you'll need to be careful about the relative
fragility of hard drives.
 
As with all backups, you will want a plan to test the integrity of data.

My friend Karsten Self's FAQ on Linux backup (with a hyperlink to my 
ftp archive of backup software):
http://kmself.home.netcom.com/Linux/FAQs/backups.html

-- 
Cheers,            "Please return all dogmas to their orthodox positions."
Rick Moen                                 -- Brad Johnson, in r.a.sf.w.r-j
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