You can’t duplicate a Squarespace site. However, you can duplicate pages within your current site or create a new site within your Squarespace account.
Duplicate a page
If you want to test edits to a page without affecting your existing content, it may help to duplicate the page. This way, you can work with the same layout and blocks as the original page.
To learn more, visit Duplicating a page.
Create a new site
If you prefer to start with a fresh template but you still need your current site, you can add a new trial site to your account. Your current site stays active while you build a new site using the same (or different) template.
To learn more, visit Managing multiple sites.
Note: Squarespace doesn't support exporting your original site and then importing it into the new trial site.
If you don’t need your current site, you can reset all content and settings and start over. This restores all of the template’s original settings and demo content so you can start from scratch.
To learn more, visit Starting over.