I want an iPad in the future but I hadn't thought about how I'm going to manage data yet. Example: I'm playing a game on my iPhone on the train. Then when I get home I use my iPad to continue playing that game but I can't because the save file is on my iPhone. Besides the obviously tedious backing up, syncing, and restoring from backup everytime I want to switch from my iPhone to iPad, what are the ways to keep my data in sync, if there exists such a way? Thank you.