Externalise DF data for AWS autoscaling

I’m installing dreamfactory on an AWS instance. It’s a part of an autoscaling group which also self heals by re-spawning any crashed instance.

I want to make sure that all users created during the last run are still available. My question is if those users are stored in a local MySQL db then how do I make that DF instance use an external MySQL (RDS) db instead. and what else should I externalise.