Kentico CMS offers native web farm support. The web farm support provides the synchronization of the changes made to the site settings on one of the servers to all the other servers and provides synchronization of the files uploaded to the site to all other servers.
You can manage web farm servers at CMS Site Manager -> Administration -> Web farm.
For more details and information about Web Farm synchronization please refer to the Module Web Farm synchronization chapter in Kentico CMS Developer's guide.