Wget

Use wget to backup a wiki:

Making an offline copy of a wiki « dale lane
 * http://dalelane.co.uk/blog/?p=233

format of wget to backup a wiki:

wget --recursive --page-requisites --html-extension --convert-links --no-parent -R "*Special*" -R "*action=*" -R "*printable=*" -R "*oldid=*" -R "*title=Talk:*" -R "*limit=*" "http://?wiki_name?/mediawiki/index.php/Main_Page"