A company uses Amazon RDS with default backup settings for its database tier. The company must make a daily backup to meet regulatory requirements and retain backups for 30 days. Which solution meets these requirements with the LEAST operational overhead?

The most straightforward solution with the least operational overhead is to modify the RDS database's automated backup retention period to 30 days. Amazon RDS automatically performs daily backups (snapshots) and transaction logs, and you simply need to configure the retention period to meet the 30-day requirement. This is a built-in feature of RDS. Writing a Lambda function or using AWS CLI for daily manual snapshots introduces unnecessary operational overhead and complexity, as RDS already handles automated backups. AWS Systems Manager Maintenance Windows are useful for scheduling tasks like patching or instance restarts, but not for directly configuring RDS backup retention, which is a native RDS setting.