So, trying to keep it short, I have previously backed up whatsapp chats to iCloud from my iPhone 6 (iOS 8+), which I have now lost, and am told that I will not be able to back up chats from the iOS 7 iPhone 5, because I've already backed up the iPhone 6 and the introduction of iCloud Drive in iOS 8 makes it impossible for you to then back up whatsapp using iOS 7. It is, however, quite important that I do, as for work reasons I need to upgrade to my new iOS 10 iPhone 6s whilst keeping chat history. Anybody know a way around this? Whatsapp says that it's backing up but doesn't move from 0% when attempting to back up the chats. Many thanks in advance for your help.