Replication (component Joomla)
component 
"Replication" is the only Joomla component (to date) that allows replicate the website (files, directories) and / or database.
Indeed, it creates an environment of pre-production and production on a single server (or two) and runs on a dedicated server environment or shared hosting (eg shared hosting OVH).
So you can have a mirror site while creating exceptions such as replication configuration.php file or retrieve user tables comment on your SITRE of pre-production.
module related article
Module and plugin
This module displays items related to a main article, in a module. It can combine items together.
rg_access (gestion des accès au contenu dans joomla) Plugin de gmaccess
Plugin de control d'accès au contenu dans un acticle (ACL) fonctionnant avec le Plugin de gmaccess