Do all my iCloud Pages' documents and folders reside on my Mac?

[Jimboj]

And if they do, what's the best way to back them up on an external drive? Just drag and drop? thanks

I do have them in my finder. Thanks.

 

[Bigeric23]

Here is where you can find them, and you can "copy" them from here, or download from iCloud Drive online. You can also configure iCloud Drive as a Favorites in Finder.

~/Library/Mobile Documents