At this time, ButterCMS does not have an automated process to export Pages and Collection content from your account. Please speak with our support team for alternative solutions.
You can export your blog posts to CSV. Here's an article with more info about it:
https://buttercms.com/kb/exporting-blog-posts
If exporting pages, we suggest users create a cron job script that pulls content into a file on your local server. This script would query our API and paginate through all of your content.