Almost a decade ago, a friend of mine told me that FaceBook had been completely integrated into the Homeland Security Database. They comb that site, along with thousands of others mining for data. People willingly offer up loads of personal information and when its online, its fair game.
Remember the discovery about the flashlight app you could download on your smart phone to make your LED flash a flashlight? Turns out the programs were loaded with Chinese spyware and corrupted phones to the point of needing to be wiped clean.
The same future is coming with "the cloud." My nephew is senior programmer for HP and he said that millions of people who rely solely upon cloud back-up will one day awake to find their entire storage either gone or corrupted.
My iMac backs up to a HD under my desk. That's as far as I want any of my data going.
Ray