back up my iphone thru itunes

What Does iTunes Backup on your computer

On a Mac with macOS Catalina 10.15, you can use Finder. On a Mac with macOS Mojave 10.14 or earlier, or a Windows PC, you can use iTunes to make a backup of your device using your computer. Syncing your device with your computer isn't the same as making a backup. A backup from a computer includes nearly all of your device's data and settings. A backup from your a computer doesn't include:

• Content from the iTunes and App Stores, or PDFs downloaded directly to Apple Books
• Content synced from iTunes, like imported MP3s or CDs, videos, books, and photos
• Data already stored in iCloud, like iCloud Photos, iMessages, and text (SMS) and multimedia (MMS) messages
• Face ID or Touch ID settings
• Apple Pay information and settings
• Apple Mail data
• Activity, Health, and Keychain data (to back up this content, you'll need to use Encrypted Backup in iTunes.)

Learn how to make a backups from your computer, how to find them on your Mac or PC, and how to delete backups that you no longer need.

You'll make a backup file.