First of all we must create a backup of the iPhone.
iTunes creates backups of settings, downloaded applications, application data and other information on the iPhone. You can use a backup to return these items to the iPhone after a software restore, or transfer information to another iPhone.
iTunes creates a backup of the iPhone in these situations:
- In sync with iTunes:
By default, iTunes syncs iPhone whenever you connect iPhone to your computer. iTunes will not perform any automatic backup of an iPhone that is not configured to sync with that computer. You can also synchronize manually by clicking the Sync button in iTunes. Note that iTunes creates a backup every single time the iPhone connects to your computer, before the first synchronization takes place. If you decide to re-sync, iTunes will not create another backup.
- Updating the iPhone: iTunes
backs up the iPhone before updating the iPhone, although it is not configured to sync with iTunes on that computer.
- Resetting the iPhone (if you decide to make a backup):
iTunes asks if you want to back up the iPhone before the restore.
Applications downloaded from the App Store will be copied the next time you sync with iTunes. Then when you sync with iTunes just copy the application data.
Source: Apple manual
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