A family member of mine recently upgraded their iPhone to an iPhone 5S (running iOS 7.1), and as I set it up and restored from a previous iCloud backup, everything went fine, until I decided to delete their old iCloud backup from the previous phone. Once I tried doing this, a message kept appearing, saying that the backup cannot be deleted, because it is still in use. Initially, I figured that perhaps the phone was still restoring, but 24 hours later, this prompt still appeared. Because of this, I decided to create a new backup for the 5S, and then I restored the phone again, but this time from the 5S backup. However, when I tried to delete the iCloud backup from the old phone, this prompt still appears. I'm unsure what's causing this and how to fix this, especially since having both of these backups leaves the user with very little iCloud backup space left. Any help is greatly appreciated. Thanks!