Pinegrow doesn’t manage the cms content at all on the production site - You build your blocks or themes and test them on a local instance with some dummy content.
Everything that has to do with managing content on the production CMS, and any desire to regularly clone production content to a local development or staging instance, is entirely a separate process from using Pinegrow. There are plugins and tools to sync multiple instances, but I don’t have personal experience or references to share.