How to restore a backup on my Apple iPhone 6S using iTunes
You can use iTunes to restore your Apple iPhone 6S from a previous backup. In this example, we use iTunes v12.5.1.21.
Note: Restoring from backup is different from performing a full software restore. Restoring from backup restores the settings, data and other information saved in a previous backup. Performing a full software restore will delete the contents of your device and restore it to the original factory settings.
1. On the computer, start iTunes.
2. Connect the iPhone 6S to the computer. In iTunes, select the iPhone 6S.
3. Click Restore Backup…
Note: iTunes will not offer this option if no backups have been performed.
4. Use the drop-down menu to select a backup, then click Restore.
5. Wait while the backup is restored.
6. Click OK.
7. Wait while the iPhone is synced.
8. The iPhone has been restored and it can be disconnected from the computer.