I did the migration and it worked!
One problem though..when trying to updating my theme with the integrated upload-function, or upload new files via wordpress, i get the message:
"Can't create the folder uploads/2013/08. Is the folder above writable by the server?"
So It seems like there's a permission/rights-problem to write to the upload folder. I probably have to change something manually. However, writing directly to the folder through ftp does work, so it has to be something inside the wordpress-settings, maybe?
Hope someone can help me out...
Looking forward to your reply again!