I'm not even sure I know enough to ask the question properly so bear with me. I've been thinking about upgrading to iCloud Drive on my devices but I feel like the warning that it gives me before I attempt to do so bears on my situation. I'm using a MacBook Pro on Yosemite, an iPhone 6 Plus on the latest iOS 8 release, and an iPad 3 that I'm never updating past iOS 7. I've got stuff on all of them and I'm signed into iCloud on all of them. Is there something I should be worried about before I pull the trigger?