bup, the deduplicating backup software, uses the git pack format for storing its data (because the tree structure of git matches really well the tree structure

bup, the deduplicating backup software, uses the git pack format for storing its data (because the tree structure of git matches really well the tree structure of how bup operates). They have written their own implementation of pack writers and readers [0]; the writers are pure-git, the readers call the git binary. [0] https://github.com/bup/bup/blob/master/lib/bup/git.py https://github.com/bup/bup/blob/master/lib/bup/git.py