It is poorly explained. I had to read the about page. Instead of 404s, you redirect to a previous version of your webserver (that is still running), which then

It is poorly explained. I had to read the about page. Instead of 404s, you redirect to a previous version of your webserver (that is still running), which then instead of 404s redirects to a previous version of your site (that is still running), and eventually it tries the wayback machine. So never pull down a previous version of your website, and issue 302s to that?