So, speaking of content, how sensitive is all the stuff in the group boards? This archive has no support for permissions, it's literally just a way for me to export a board to flat HTML that someone could store anywhere (easy to save to your personal computer). I imagine some people would rather that content of the old Group forums didn't become public en-mass? Or does anyone really care?
It's easiest for me if I create one big massive archive with no regard to former permissions, but if there is a concern about previously private conversations, I can switch things around and produce group-specific archives that group owners could receive and handle as they see fit.