WikiTeam has just finished archiving all Wikimedia Commons files up to 2012 (and some more) on the Internet Archive: https://archive.org/details/wikimediacommons
So far it's about 24 TB of archives and there are also a hundred torrents you can help seed, ranging from few hundred MB to over a TB, most around 400 GB.
Everything is documented at <https://meta.wikimedia.org/wiki/Mirroring_Wikimedia_project_XML_dumps#Media_tarballs> and if you want here are some ideas to help WikiTeam with coding: <https://code.google.com/p/wikiteam/issues/list>.

Nemo

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