Before suing ask nicely. Only take out a stick when no other recourse is possible. Google cache saves certain portions of the site - probably text only- but you can try (read about it here http://googlesystem.blogspot.com/2007/01/browsing-web-using-google-cache.html) and the waybackmachine at the Internet Archive backs up some stuff - probably only text as well but you can try http://www.archive.org/index.php

My vote is for 'just ask'. Assuming you paid him for the work then you are entitled to a copy.