This thing is driving me crazy. I keep getting the message "This iPad cannot be backed up because there is not enough iCloud storage available." My total storage is 5.0 GB; Available 5.0 GB. So what's the deal? Keeps telling me to delete some data. The only thing I have on here is pictures, that it won't allow me to delete. I find it hard to believe that I've used 16 GB, when I have no documents or anything but some pictures on it. I have a bunch of Kindle books, but they are all supposedly in cloud.