[MM3-users] MM2 to MM3 on different server. Process to move everything at once.

Is there a way to move everything from an MM2 server to a new MM3 server (on separate servers)? I have been migrating individual lists, which seems to work OK, but there are so many lists that it would have to be done over a longer period of time. I was hoping I can just migrate a database or something and have it all done in an hour or so. Thoughts?