I'm not sure if it makes sense to ever have data managed by the central repository to be kept on local user machines because the point is that data access is centralized and available to all users (with appropiate access rights). Maybe you have an application where personal desktop information is to be managed?
But on the server side, I agree that it does make sense that the central file vault area be something that can be distributed across multiple server devices. Ideally connected via agents rather than by having to rely on mounting volumes by the central server. Are there any plans for doing this?