I don't think it's so important that the Stack Exchange websites are included in the Internet Archive's Wayback Machine. What really matters to me is that, like

I don't think it's so important that the Stack Exchange websites are included in the Internet Archive's Wayback Machine. What really matters to me is that, like Wikimedia websites (http://download.wikimedia.org/ http://download.wikimedia.org/), they offer downloadable dumps under a free license (https://archive.org/details/stackexchange https://archive.org/details/stackexchange). This way, anyone who wants can mirror their contents.