How to Back Up iPhone or iPad in macOS Catalina with Finder

You’ll need a USB cable to complete an iOS or iPadOS backup to MacOS, beyond that it’s just a matter of performing the following operation:

1,
Plug your iPhone or iPad device into your computer using a USB cable and open a Finder window by clicking its icon in the Dock

2,
With a Finder window open, click your iPhone or iPad’s name in the sidebar.

3,
If it’s the first time you’ve used your device with this Mac, click the “Trust” button to allow it to connect. You’ll need to enter your passcode to authenticate on the iPhone or iPad itself.

4,
The next screen you will see should be immediately familiar because it’s very similar to iTunes. Click the “General” tab and then check the option “Back up all of the data on your [‌iPhone‌/‌iPad‌] to this Mac.” 

5,
If you want to create an encrypted backup, select “Encrypt local backup.” This ensures the backup also includes sensitive data like keychain information and more. You’ll be asked to provide a password to allow you to decrypt the backup when the time comes, too.

6,
Click “Back Up Now” and wait for the process to complete.
That’s all there is to it.