Apple has already started to email former MobileMe customers that their free 20GB of additional iCloud storage will no longer be valid at the end of this month (Sunday, September 30th), and those who exceed the free 5GB limit by then will need to fork out more for the additional storage, as well as “backups to iCloud will stop, and apps will no longer be able to save documents to iCloud.” You would do well to check out what are some of the files you have in iCloud that you no longer need in order to remain within the 5GB free storage limit, unless you do not mind paying more for the extra storage, of course.