Hmm. This is actually not really something I need, I think; but I consider anna's archive etc... as about as important as the internet web archive. We need to preserve data, at the least important data, also historic data - how the original websites looked. Creativity of past generations. Same for games and books.
It may be only ~30 years for webpages to have emerged, but there are also many young people who may not have experienced that since they are too young to have experienced it. There is always a generational change; our generation has the opportunity to store more things.