1. First, click on the iMazing icon at the top of your screen. (If iMazing is not open, navigate to your Applications folder or to your Dock to open the iMazing application)
2. Click on the iMazing icon and navigate to the drop-down arrow on the left of the pop-up box. Shown below in the red box.
3. In the menu, select 'Back Up' from the list.