I need a site mirroring system, that mirrors a sites databases and all the files and pages to a backup server. Anyone have any advice/scripts on how to do this? Thanks

I will suggest using rsync over SSH. Sounds like the tool you are looking for.

http://rsync.samba.org/

wget works well to. http://www.gnu.org/software/wget/wget.html

as do the following
http://www.inf.utfsm.cl/~vparada/webcopy.html
http://langfeldt.net/w3mir/