I have read time and again the importance of doing a backup before installing an IOS update; but what if Apple "blows in" an update automatically without your permission? A couple of nights ago, I connected my iPhone 6 to my PC to sync it with that computer. After about an hour, I found that the IOS update was underway, and I received a warning to not close iTunes for that reason. Next morning, I was confronted with the Setup routine - not terribly difficult to accomplish, but annoying because I wasn't expecting the update and hated to take the time to do the setup. Fortunately, I have passcodes disabled, so I didn't have to worry about that. I wish that those updates were delivered with an option to install or not install them, allowing the user to back up the phone before doing the update. From a practical standpoint, however, the best advice I can offer is to back up your phone frequently so that you won't lose much if one of these updates is "blown in" upon you without previous notice.