OK, I'm sold on the ease of use. However, I'm looking to host a SAAS application that requires a separate database for each subscribed client. How does AWS handle the isolation and privacy of the database(s) - so that the likelihood of one of our clients accessing another client's data (even accidentally) is minimized, and access from outside our framework (our support or clients)? There's also the issue of minimizing downtime in the event of a restore request to a specific client - so not all clients are affected. Finally, we have health care and public sector clients who have very stringent data protection and privacy policies and issues. Does that kind of protection exist in AWS, or any shared environment, or does it require a dedicated solution?