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Re:Bup: Efficient file backup system based on the git packfi... by leephillips on Sunday February 16, 2014 @01:47PM (#7248670)
Not really closely related, but another solution that uses git infrastructure to back up large files is git-annex:

https://git-annex.branchable.com/

Re:Bup: Efficient file backup system based on the git packfi... by rsync on Sunday February 16, 2014 @03:14PM (#7249068)
... and there are some tangential benefits to using git-annex as well:

http://rsync.net/products/git-annex-pricing.html

Re:Bup: Efficient file backup system based on the git packfi... by bambambazooka on Monday February 17, 2014 @05:16AM (#7251362)
and git-annex has a bup backend :)