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You have some control over the amount of storage that you’re using iCloud. From the iCloud preference pane on Mac or the iCloud control panel on Windows, you can view how much storage you’re using from your free 5 GB allocation, choose to remove some data to free up space, and purchase more iCloud storage space.
Remember, music, apps, books, and TV shows that you purchased from the iTunes Store, and photos in your Photo Stream, don’t count against your 5 GB of free storage.
To manage your iCloud storage on a computer
1. Choose System Preferences > iCloud on the Mac.
or
Choose Start Menu > Control Panel > iCloud on Windows.
The iCloud settings window appears . At the bottom of the settings window, there is a bar graph showing you how much iCloud storage you have available.