The host we use for our e-commerce site has a built-in method for cloning a site to a sub-domain. So I will start by saying that I have not used this WP-Staging plugin. I came across it in a question and answer on the WooCommerce support site, where Support suggested it.
That said, the plugin has got almost 2,000 five-star reviews, which is a pretty good indicator of its worth.
There’s a pro version for pushing from the staging site to a live site. If someone was in the business of managing other people’s sites, then it would be worth looking at.