Board Thread:Support Requests - Getting Started/@comment-168547-20151112180513/@comment-5454372-20151112211620

From memory, Help:Database download and Help:Exporting pages should be relevant -- you'll definitely need the information about importing in the second link for reconstructing the content to another wiki.

Edit: fair warning, these won't preserve the image files -- I don't know of a way to do that quickly yet.