Your iPhone stores all of your important data—including photos, videos, contacts, and messages—in a backup on your computer. If something happens to your iPhone, you can use this backup to restore your data to a new iPhone.
To restore your iPhone from a computer backup:
1. Connect your iPhone to your computer and open iTunes.
2. Select your iPhone in the iTunes sidebar, then click the Restore Backup button.
3. Select the backup you want to restore, then click the …