Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 588 discussion

A, B, C => cross-region $$ D => copy snapshots -> most cost-effectively.

Option D: Copy automatic snapshots to another Region every 24 hours. Explanation: This option involves copying RDS automatic snapshots to another Region. It is a straightforward way to ensure that snapshots are available in the event of a disaster. Since RDS snapshots are typically incremental and copied periodically, this solution matches the 24-hour RPO requirement effectively and is cost-effective compared to maintaining constant cross-Region replication.

Cross region data transfer is billable so think of smallest amount of data to transfer every 24 hours

Amazon RDS creates and saves automated backups of your DB instance or Multi-AZ DB cluster during the backup window of your DB instance. RDS creates a storage volume snapshot of your DB instance, backing up the entire DB instance and not just individual databases. RDS saves the automated backups of your DB instance according to the backup retention period that you specify. If necessary, you can recover your DB instance to any point in time during the backup retention period.

most cost-effective way is just copying the snapshot (24h delta in the storage). => D

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This is the most cost-effective solution because it does not require any additional AWS services. Amazon RDS automatically creates snapshots of your DB instances every hour. You can copy these snapshots to another Region every 24 hours to meet your RPO and RTO requirements. The other solutions are more expensive because they require additional AWS services. For example, AWS DMS is a more expensive service than AWS RDS.

Snapshots are always a cost-efficience way to have a DR plan.