The Cloner copies everything you need to have a totally identical twin site: all media uploads, posts, pages, custom post types, taxonomies, comments, menus, WordPress options, theme and plugin settings (including which ones are active), users, roles, etc.
Theme and plugin files themselves are the only thing not copied by the Cloner. For cloning inside a multisite network, that’s not even needed, and for cloning to a remote site, you’ll just need to quickly transfer those via FTP. Then the Cloner will handle all the tricky database stuff for you.