Hi Junod,
This is more for Patrick, I think. A backup/mirror of the contextgarden stuff may be a good idea
My server (http://context.aanhet.net, holland) hosts a mirror of the pragma-ade site and the subversion manual repository, and I do not see a lot of traffic from that (less than 1GB / month). There is also Patrick's mirror at http://mirror.contextgarden.net (germany), so my guess is that the pragma site is nicely covered (within west-europe, at least).
Cheers, taco
Perhaps a CPU/bandwidth donation could be used to combine the newly prepared archive of old ConTeXt files with "ConTeXt live" to get the benchmark working (repository with test files to be compiled with different ConTeXt versions), but this would need some man-week(s) first, not only CPU. Mojca