If you want to set up your database with AWS backup, and a native backup to a common backup S3 bucket, then set up RDS and AWS Backup in the constructor. Don't set up the S3 bucket, pass that in as a parameter. It's all fairly intuitive.

Also design everything to be unit testable. Component Resources' winning feature (for me) is that it lends itself to TDD in a way that almost nothing else in IaC does.