If you're limited on iCloud storage space, you can manually decide what app data you want, and what you don't.
If you're on a free iCloud storage plan, you are probably already aware that you only get 5GB to store your information. That isn't a lot of space, especially if you own multiple iOS devices. One way you can free up some additional storage to use elsewhere is by manually choosing what app data gets stored, and what won't.
Full story from the iMore Blog...