iCloud: Back up fewer apps to save storage
Many iOS apps automatically back up data in iCloud. You can increase available iCloud storage space by backing up only some apps’ data.
Turn backup on or off for specific apps
Do one of the following:
On your iOS 8 device: Go to Settings > iCloud > Storage, then tap Manage Storage.
On your iOS 7 device: Go to Settings > iCloud > Storage & Backup, then tap Manage Storage.
Tap the name of your iOS device then, under Backup Options, turn Backup for each app on or off.
The amount of iCloud storage each app uses is shown below each app in the list.
The apps list may be abbreviated. Tap Show All Apps to see a complete list.
Some Apple apps, such as Messages and Voice Memos, back up data in iCloud but aren’t included in the list of apps. You can only turn off backup for listed apps.