Export Large Squarespace blog to new Squarespace website - job 1 of 2

We have about 2,000 blog posts in our existing Squarespace site. We are in the processing of rebuilding the site at 7.1, and need help exporting the existing posts from the existing site to the new site without losing the URL slug and including the images for each post. Believe Squarespace had this functionality, but it appears to have gone away.