Summarize the following:
Use the USB cable that came with the iPhone. You can use iTunes to reload any of your previous iPhone backup files. On macOS Catalina, you can find your iPhone and iPhone backup in Finder.  Restore Backup... button. This will open a new window, allowing you to select the backup you want to use. If you have backed up different devices on your computer, you will be able to select from any of the available updates. Make sure to pick the one that you want to use. Restore to begin restoring the iPhone. The process may take a while, especially if you are restoring a large backup file. You can monitor the restore process on the iPhone's screen. A progress bar will indicate how much of the restore process has been completed.

Summary:
Open iTunes and connect your iPhone to your computer. Select your iPhone to open the Summary page. Click the . Click .