The git-annex allows managing files with git, without checking the file
contents into git. While that may seem paradoxical, it is useful when
dealing with files larger than git can currently easily handle, whether
due to limitations in memory, checksumming time, or disk space.

Even without file content tracking, being able to manage files with git,
move files around and delete files with versioned directory trees, and
use branches and distributed clones, are all very handy reasons to use
git. And annexed files can co-exist in the same git repository with
regularly versioned files, which is convenient for maintaining
documents, Makefiles, etc that are associated with annexed files but
that benefit from full revision control.

WWW:	http://git-annex.branchable.com/