Back up iPhone to Mac iOS Monterey

It uses Finder instead of the iTunes app. See instructions below from Back up iPhone - Apple Support

Back up iPhone using your Mac

1. Connect iPhone and your computer with a cable.
2. In the Finder sidebar on your Mac, select your iPhone.
3. To use the Finder to back up iPhone, macOS 10.15 or later is required. With earlier versions of macOS, use iTunes to back up iPhone.
4. At the top of the Finder window, click General.
5. Select “Back up all of the data on your iPhone to this Mac.”
6. To encrypt your backup data and protect it with a password, select “Encrypt local backup.”
7. Click Back Up Now.

Note: You can also connect iPhone to your computer wirelessly if you set up Wi-Fi syncing.