My dad shattered the screen of his iPad 3 and I took it to Apple Store and got an expensive replacement unit (there is no AppleCare+ in Hong Kong). I did a full iCloud backup of the old unit before going to the Apple Store but when I got back home and set up the iPad it showed that there isn't any available backup. I was in a panic but anyway tried to search in Google and found that it's because the unit was running iOS 5.1.1 only. I upgraded it to 6.0.1 and then I could restore using the recent backup. 😡