WikiTeam has released an update of the chronological archive of all Wikimedia Commons files, up to 2013. Now ~34 TB in total.
Just seed one or more of these torrents (typically 20-40 GB) and you’ll be like a brick in the Library of Alexandria (or something), doing your bit for permanent preservation of this massive archive.
From <a href="http://lists.wikimedia.org/pipermail/wikimedia-l/2014-August/073575.html" title="[Wikimedia-l] [Wikimedia Announcements] 34 TB Wikimedia Commons files on archive.org: you can help">this post to wikimedia-l</a>.