wgetを使用してサイトをミラーする
コマンド：
wget -mk http://www.example.com/
GNU’s wget command line program for downloading is very popular, and not without reason. While you can use it simply to retrieve a single file from a server, it is much more powerful than that and offers many more features.
詳しくは http://fosswire.com/post/2008/04/create-a-mirror-of-a-website-with-wget/