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From: Francisco Reyes <lists@stringsutils.com>
To: krad <kraduk@googlemail.com>
Date: Fri, 09 Jul 2010 11:06:44 -0400
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Cc: Liste FreeBSD <freebsd-questions@freebsd.org>
Subject: Re: Global backup solution for FBSD & Ubuntu
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krad writes:

> In my experience dedup requires a fairly large amount of juice so if your
> backups are large I hope you machines are big on ram

The way tarsnap does it is not that intensive. I have used in an old 900Mhz 
machine with less than 640MB of RAM and it worked well.
I think the program computes some sort of hash for blocks of data and then 
the server checks to see if it already has that block.