LANDING Base allow you to export your sites at any given time. When you're ready to export your site, first simply click the button labeled "Export" as shown bellow:
Clicking the export button will bring up a modal window.
Here, before you export your site, you can choose an alternative Document Type (by default it's set to HTML 5 which is the recommended setting).
Click the "Export Now" button to download a ZIP archive of your entire site, including all CSS files, Javascript files and images.