How the serevr repository is organized?

Hi there,
I'm designing a backup system. At server side, between each backup, I would
like to keep only changed files, so to save lots of server space.

I think Subversion should have similar solution to manage repository. So I
send this message to the development team and hope someone who know how the
SVN backend works can give me a little heads up, or point a direction for me
to go.

Thank you in advance!

-- 
Li Ma
lima01_at_gmail.com
http://www.idealtechs.com
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http://subversion.tigris.org/ds/viewMessage.do?dsForumId=462&dsMessageId=1200072