I'd like to recommend establishing functionality within the CRM Online UI to allow an adminitrator to request a backup of the SQL database for their org. Especially once CRM 2011 goes live, I see organizations wanting to use CRM Online as their Production envrionment, but may want to host a Dev environment in house and would want to refresh that Dev periodically with updated data from Prod for testing purposes (and customizations if they've not been adhering to best practices of building in Dev then moving to Prod).