When I open iTunes and click on my phone icon, all of my settings look good except for backups which is set to "This Computer." I check off iCloud and click "Apply" and it instantly switches back to "This Computer." I'm signed into iCloud on the phone and the computer with the same account. I have plenty of space in iCloud as well so that shouldn't be a problem. Why does it switch and how can I get it to stick to iCloud?