Looks like there is a lot of source material to work with. I'm not exactly sure what historians do with historical data, and preservation is important to be sure, but, there's got to be a lot more to it than that (I confess, I'm woefully undereducated in history and most of the humanities). I'm sure with a community as big as ours, we have folks experienced in this sort of thing.
We have to decide what to archive. Anything is potentially useful such as forum posts, emails, dramatic stories, etc. I guess the best place to start would be to ask where Bitcoin started and how it grew in the early days.