after all when you move all your data in new server [ with ftp ] and change property each folder or file [ to 777 ] and make new database and dumb it.
It will work ....
But one thing not work for sure all related with 1.check new image [ work but with problem, some image will detect as new image even that image allready in database ]
2.auto thumbnailer [ this is big problem allthought they made the thumb but in UNIX host all those thumb will don't have property (empty ) shomething like broken image ]
3.resize image
and until now just wonder , how to fix this