If you enable iCloud backup on your iOS 5 device, all photos, documents and app data from your iPhone, iPad or iPod touch will upload to iCloud automatically. If you want to stay under the 5GB limit for free storage, though, definitely manage the app data you back up.
Launch Settings and go to iCloud >> Storage & Backup.
Here you’ll see the available storage of your free 5GB account. Tap Manage Storage.
Now tap your device.
Next you’ll be at the Info screen. Here you can manage what app data is backed up to iCloud.
Scroll down the screen and turn off the apps you don’t want backed up. A list of apps using the most space is available. To manage the others, tap Show All Apps.
When you turn off an app, you’ll get a verification message. It will delete the backup data already stored in iCloud. So be cautious.
Don’t worry about the data stored locally on your device. It’s still there. You’re only deleting the backup data from iCloud.
To save storage space on your device, a great method is to batch delete photos and videos.
If your free 5GB of space on iCloud account is filling up, remove some apps to get more space.