From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Riesen <raa.lkml@gmail.com>
Subject: Re: Trying to use git-filter-branch to compress history by removing large, obsolete binary files
Date: Mon, 8 Oct 2007 00:08:53 +0200
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To: Elijah Newren <newren@gmail.com>
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Elijah Newren, Sun, Oct 07, 2007 23:23:59 +0200:
> # Try to recompress and clean up, then check the new size
> git gc --aggressive --prune
> du -ks .                       # 10580K !?!?!?
> du -ks .git                    # 10564K

git-filter-branch makes a backup of your original references:

$ git filter-branch --help
...
       Always verify that the rewritten version is correct: The original refs,
       if different from the rewritten ones, will be stored in the namespace
       refs/original/.
...

These will keep your big files in repository.