WikiTeam[1] has released an update of the chronological archive of all Wikimedia Commons files, up to 2013. Now at ~34 TB total. https://archive.org/details/wikimediacommons I wrote to – I think – all the mirrors in the world, but apparently nobody is interested in such a mass of media apart from the Internet Archive (and the mirrorservice.org which took Kiwix). The solution is simple: take a small bite and preserve a copy yourself. One slice only takes one click, from your browser to your torrent client, and typically 20-40 GB on your disk (biggest slice 1400 GB, smallest 216 MB). https://en.wikipedia.org/wiki/User:Emijrp/Wikipedia_Archive#Image_tarballs

Nemo

P.s.: Please help spread the word everywhere.

[1] https://github.com/WikiTeam/wikiteam