It’s not really cloning your site. The default settings will cache static content for a short period of time (a few hours to a few days, depending on traffic).
By default, it does not cache dynamic content, such as .html or page source.
You could manually configure Cloudflare to cache dynamic content, and then it’s up to you how long to set that cache duration. Or manually purge the cache is you want a refresh.
thanks for your answer. I have a EU server based in Portugal, with several wordpress sites and sub sites and want my US costumers to to able to get a fast access to them.