When you connect your iPhone to a computer, you can perform a "local backup." This creates a copy of nearly all your device's data and settings directly on your computer's storage.
It is a manual process; if you forget to plug in, you don't have a recent backup. The Evolution of iTunes icloud itunes
You may need to pay for a monthly storage plan if you have more than 5 GB of data. 💻 iTunes (or Finder) Backups When you connect your iPhone to a computer,