@hospadam, what we did for the webflow.com homepage is design everything in one page (e.g. header, footer, home page, then subpage content like about, terms of service, etc), then exported, and then separated into different pages manually.
This is (only slightly) better than duplicating the site (which you can do by pressing Duplicate on your site settings page), all your styles are shared in one place. If you duplicate a site, you run into the danger of having to update common components in two different places if you (for example) need to update a shared header after you’ve already duplicated.
Thanks for you patience as we work on true multi-page support where these kinds of hacks won’t be required.