I've installed the following packages because they sound interesting for the task. For now of all of them I just use git git-annex.
ii bup 0.25-1 amd64 highly efficient file backup system based on git
ii git-annex 5.20140927 amd64 manage files with git, without checking their contents into git
ii graphviz 2.38.0-6 amd64 rich set of graph drawing tools
ii tahoe-lafs 1.10.0-2 all Secure distributed filesystem