iCloud: iCloud storage and backup overview
When you sign up for iCloud, you automatically get 5 GB of free storage. Your iCloud storage is used for iCloud Backup, app data and documents stored in iCloud, and iCloud Mail (your @icloud.com email account).
If you run out of space, there are several ways you can increase your available iCloud storage. For example, you can decrease the size of your Camera Roll backup, change which apps you back up, or delete documents and old email messages you no longer need. You can also increase your storage by upgrading your storage plan. For more information, see iCloud storage management overview and Upgrade your iCloud storage.
What iCloud backs up
You have important information on your iPhone, iPad, and iPod touch. iCloud automatically backs up your device over Wi-Fi every day while it’s turned on, locked, and connected to a power source. With your device information backed up in iCloud, you can easily set up a new device or restore information on one you already have.
Here’s what iCloud backs up:
Purchased history for music, movies, TV shows, apps, and books
Your iCloud backup includes information about the content you have purchased, but not the purchased content itself. When you restore from an iCloud backup, your purchased content is automatically downloaded from the iTunes Store, App Store, or iBooks Store. Automatic downloading is based on iTunes in the Cloud availability by country, and previous purchases may be unavailable if they have been refunded or are no longer available in the store.
Photos and videos in your Camera Roll
Home screen and app organization
iMessage, text (SMS), and MMS messages
Your iOS device backup only includes data and settings stored on your device. It doesn't include data already stored in iCloud, for example contacts, calendars, bookmarks, mail messages, notes, shared photo streams, My Photo Stream, and documents you save in iCloud using iOS apps and Mac apps.