A company runs database workloads on AWS that are the backend for the company's customer portals. The company runs a Multi-AZ database cluster on Amazon RDS for PostgreSQL. The company needs to implement a 30-day backup retention policy. The company currently has both automated RDS backups and manual RDS backups. The company wants to maintain both types of existing RDS backups that are less than 30 days old. Which solution will meet these requirements MOST cost-effectively?