I just received a message when I turned on my Air2 that there was not enough iCloud space with my account so it was unable to do a backup and it had a button to upgrade my space. I just put some large videos on the iPad, so I'm guessing that is why I ran out of space, because it is trying to back those up? 1. What exactly does iCloud try to back up off the iPad? 2. When does it perform these backups? Thanks.