Courtesy of Apple
You can also manage previous backups from here and choose to sync different types of media with your computer while you’re at it.
Backing Up to MacOS Mojave 10.14 or Earlier
iTunes is not dead yet. The service is still available on older OS versions, so you can still back up everything there. Here's how:
Once your phone is plugged into your Mac, open iTunes and click the Device button at the top left of the iTunes window. Click Summary below your iPhone. Select Back Up Now under Backups. This creates a backup of everything on your iPhone, including all your app data, so you don't have to log in to all your accounts again. It also saves your home screen arrangement, so you don't have to drag a bunch of icons around. If you want to encrypt your backups, click on Encrypt iPhone backup and type a password, then click Set Password.
Pro tip: New backups now overwrite the old ones, but if you click Manage Backups, right-click on a backup, and select Archive, you can save multiple backups over time. Just dive into iTunes Preferences, click on Devices, and click Summary for your iPhone to see a list of every backup. As long as the one you need is there, you can hit Restore Backup.
Backing Up to a Windows PC
You can also back up your iPhone on your Windows PC using iTunes. Here's how:
Connect your iPhone to your Windows computer. Open iTunes and click the iPhone button at the top left of the iTunes window. Click Summary. Select Back Up Now under Backups. If you want to encrypt your backups, click on Encrypt local backup and type a password, then click Set Password.
How to Turn On Wi-Fi Syncing
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