You can go to site settings in the site, and click to save the site as a template. There’s a box called “include content”. Just leave that box unchecked, and you’ll have a backup of the site without content. This new file will be stored in your site gallery at the top level of your site collection. Each time you create a new site in the site collection, that template will be one of the options. Simples!!!
It’s very easy to find out any matter on web as compared to books,
as I found this post at this website.