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One change that announced at WWDC was that there would be a “family feature” with iOS 8, so that there aren’t all the problems associated with shared iCloud accounts. What problems, you ask? Kids deleting all of their parents business contacts, embarrassing photos of girlfriends/boyfriends syncing with parent devices. iMessage being used by multiple people. I know this is not exactly what you asked, but it seems pretty relevant. Ask someone who works at an Apple store if having cloud backup on shared accounts has ever caused any problems...I bet they will have some entertaining examples for you.