It's automated. Every time a setting for a game changes, the data migrates to the new server. Same with user accounts -- as soon as you change anything about your account (or if we ban you), that change gets migrated to the new system behind the scenes. It's a pretty slick system, and ensures that while we get AG3 ready, we don't lose a single bit (pun intended) of data.
We've already set it up for users and games, and I'll probably be working on game ratings next week. We have other things to migrate in this fashion as well.
