How to back up my iPhone using iCloud
1. Touch Settings.
2. Touch your Apple Account.
3. Touch iCloud.
4. Touch Continue.
5. Touch iCloud Backup.
6.
Touch the slider to turn on iCloud Backup.
7. Your iPhone will backup to iCloud.
8. To carry out a manual backup, touch Back Up Now.
9. Your iPhone will backup to iCloud.
10. The backup is now complete. Your iPhone will now perform an automatic iCloud backup daily when it's charging and locked.