data mining forums

We require software to spider/data mine the contents phpBB forums on the internet to create a similar copy of the forum. Once data of usernames and posts is mined, we wish it to be stored in mySQL database and merged into a new installation of phpBB. We do not require full user accounts (like passwords, images, etc), we only require this to create backup copies of forums mainly for the content. We would like end result to be a mySQL database which can be merged into a new phpBB installation. Must have usernames/topics/posts. End result: we desire to make backup copy (ar as close as possible) of a forum's users and contents without access to the server hosting the forum. Similar to Google's cache of a forum.