iCloud backs up to iPhone daily over Wi-Fi, when it’s connected to a power source and is locked. The date and time of the last backup is listed at the bottom of the Storage & Backup screen. iCloud backs up your:
Purchased music, TV shows, apps, and books
Photos and videos in your Camera Roll
iPhone settings
App data
Home screen and app organization
Messages (iMessage, SMS, and MMS)
Ringtones
Note: Purchased music is not backed up in all areas and TV shows are not available in all areas.
If you didn't enable iCloud backup when you first set up iPhone, you can turn it on in iCloud settings.
Turn on iCloud backups: Go to Settings > iCloud, then log in with your Apple ID and password, if required. Go to Storage & Backup, then turn on iCloud Backup.
Back up immediately: Go to Settings > iCloud > Storage & Backup, then tap Back Up Now.
Manage your backups: Go to Settings > iCloud > Storage & Backup, then tap Manage Storage. Tap the name of your iPhone.
Turn Camera Roll backup on or off: Go to Settings > iCloud > Storage & Backup, then tap Manage Storage. Tap the name of your iPhone, then turn Camera Roll backup on or off.
View the devices being backed up: Go to Settings > iCloud > Storage & Backup > Manage Storage.
Stop iCloud backups: Go to Settings > iCloud > Storage & Backup > Backup, then turn off iCloud Backup.
Music that isn’t purchased in iTunes isn't backed up in iCloud. You have to use iTunes to back up and restore that content. See Syncing with iTunes.
Important: Backups for music or TV show purchases are not available in all areas. Previous purchases may be unavailable if they are no longer in the iTunes Store, App Store, or iBookstore.
Purchased content, as well as Photo Stream content, doesn’t count against your 5 GB of free iCloud storage.