I have a Droid X and I'm coming up on eligibility to upgrade. I'm thinking of getting a Galaxy Nexus, but I'd like to be able to transfer my app data (not just apps or media, but app data, such as Angry Birds save files) to my new phone. Seeing as the Nexus doesn't have an SD card slot, how would I do this? Would I need to purchase a backup app, or are there free solutions available?