This is useful when you want to keep an existing dashboard, but modify it to show different information, or make a copy of one owned by someone else and add your own modifications. A window lets you rename and choose privacy options. When you duplicate a dashboard, you own the new copy.
Note: A Super Admin managing multiple sites can create dashboards that are meant to be cloned by local managers who modify it to show information relevant to their site. For example, a dashboard that monitors all queues for all locations, could be duplicated by managers at each location and modified to show only the information they need.