The following diagram depicts the components of a Controller deployment on AWS.

Configure an Application Load Balancer in front of the Controller and ensure SSL terminates at the Elastic Load Balancer.

With Amazon Relational Database Service (RDS), you no longer need to worry about database backups, as it takes care of this for you. Also, you no longer need to implement high availability (HA) on your own, since you can instead leverage the Standby Replica that Aurora/RDS offers and the Aurora database is horizontally scalable. With the multi-AZ deployment option, Aurora offers 99.95% availability.