JumpBoxes are ideal for a fresh start of an application but it is often possible to import an existing application into a JumpBox. You would first need to register your JumpBox then you might try following the guidance provided for mediawiki found here:
http://www.mediawiki.org/wiki/Manual:Moving_a_wiki

Good luck
Austin

I guess I have to "pscp" it to eg the Images folder
and restore a sql backup?