my iPhone 6 will not backup to iCloud. It hasn't done it since updating to iOS 9. Even the latest update (9.0.2) which was supposed to solve certain backup problems didn't fix it. It will not backup whether automatically or manually. My iPad backs up to iCloud perfectly, but my iPhone will not. Help!!!
iPhone 6, iOS 9.0.1
You might try a forced shutdown to begin with, hold down the top and home buttons together until the device shuts down, then restart it.
First check that your device is correctly connected to the wifi/internet (settings > wifi)
If your back up continually fails, you might try turning off back up on your mobile device (settings > iCloud > storage & backup) and then deleting the backup file from iCloud by swiping the backup file on the mobile device (settings > iCloud > storage & backup > manage…) and then turning back up on again.
If this doesn't help, try turning off some items for back up in a pattern to try to establish if your problem is being caused by specific data on your device.
Being able to back up to the cloud can be very useful, especially if you don't have access to a computer or have infrequent access to one, however unless you specifically need to use iCloud for back up, you will find backing up to iTunes significantly more convenient and possibly more reliable.
iOS 9 not backing up to iCloud
