The best would be to use the wayback machine site and go back in time to look at the site. Just pick a date in the past here: https://web.archive.org/web/*/clanbase.com
As a side note ScrimBase is about to be launched and is basically a modern version of Clanbase with ladders and cups. I know the developers and they've been working on this for month, it's literally just about to be launched in Quakelive will be featured as one of the many games from the launch: http://www.scrimbase.com/ https://www.facebook.com/scrimbase/