Bought a new laptop and installed yosemite. I have an iPhone 5. Thought I would try iCloud, but it used up my iPhone data allowance *way* too fast. Now I want to go back to regular sync and use a real online backup system. When I try to turn off iCloud, I get a message that files will be deleted from my laptop. Very sorry I ever tried this. Exactly why is iCloud deleting files from my laptop, and how do I stop it from doing so?