So I got my new iPad mini 4 today. While setting it up I recognized that 1,3 GB of 5 GB of my iCloud space are being used. After i logged in on icloud.com I was able to see that the 1,3 GB are being used by a backup. I guess it's an old backup from the iPad mini 2 I sold a couple of days ago. My problem is that I am not able to delete this backup because it doesn't show in my iPad mini 4 and iPhone 5s (both running iOS 9.1) iCloud space management. What can I do? I already googled a while, but all the guides I found only gave information about how to delete a VISIBLE backup, which mine unfortunately is not.