iCloud allows you to back up your settings and documents to Apple servers, allowing you to easily back up and restore when you upgrade your devices.
1. Open [Settings] from the home screen and tap [iCloud]
2. After opening the iCloud settings page, tap on [Account]
3. Enter your account information. If you do not already have an Apple ID, you may need to create one.
4. After entering your information, go back to the iCloud settings page. Scroll down to the bottom of the page and turn on [Find My iPhone]
5. Next, press [Storage & Backup]
6. Make sure iCloud Backup is turned [On]. Then, press [Back Up Now] if you have never backed up.