Go to your iPhone or iPad, then tap on Settings > General > iTunes Wi-Fi Sync.
Select your computer from the list and click "Sync Now".
Connect your iPhone or iPad to your computer and launch iTunes.
Go to the top left corner, click on your device. Then you will see your device information, backups and the other options.
Navigate to the second part “Backups”, then click on “Back Up Now” to backup your iPhone or iPad to iTunes (actually all of the backup data was saved on your computer).
Launch iTunes and connect your iOS device to your computer.
In iTunes, click on your device, which appears in the upper-left corner.
Select "Restore Backup..." under Backups section on the right panel .
