This version adds automatic backup of your progress (rewards/achievements). The backup is made each time you go to the title. If you progress gets lost for some reason, the backup will automatically be used to restore the progress. Like most backup systems, this means that you may lose a little bit of progress if the backup has to be used, but not all of it.
Note that the backup does not protect your data if you uninstall the game. It mainly prevents data loss if the phone is forced to kill the game while its in the middle of saving progress (due to low power, etc).