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!!!
Happiness = incidental byproduct of work well done.
paulgilbride.com 
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as I found this post at this website.