This menu item is either used to restart ArchivistaBox or to switch it off.
You will also find 'Online update' here. If you click on this and confirm the prompt, a new version of the ArchivistaBox will be installed. After the first click on 'Online update' please click again on the same button. If the message 'Update in progress...' appears, the ArchivistaBox will be updated. As soon as no message appears when you click on 'Online update', the ArchivistaBox is up to date. The update can now be activated with 'Restart ArchivistaBox'.