Which solution meets these requirements MOST cost-effectively?
Search AWS Marketplace. Find a third-party solution to deploy to automatically manage the EBS volume backups.
Create a second Lambda function to move the EBS snapshots that are older than 30 days to Amazon S3 Glacier Deep Archive.
Set an Amazon S3 Lifecycle policy on the $3 bucket that contains the snapshots. Create a rule with an expiration action to delete EBS snapshots that are older than 30 days.
Migrate the backup functionality to Amazon Data Lifecycle Manager (Amazon DLM). Create a lifecycle policy for the daily backup of the EBS volumes. Set the retention period for the EBS snapshots to 30 days.
Explanations:
Third-party solutions can add extra costs, as they often charge for additional services, making it less cost-effective.
EBS snapshots cannot be moved to S3 Glacier Deep Archive directly, and this option would not automate snapshot deletion.
EBS snapshots are not stored in S3, so S3 Lifecycle policies cannot be applied to them.
Amazon DLM provides automated snapshot management with a retention policy, keeping costs low by retaining only needed snapshots for 30 days.
It appears that the answer is:
Migrate the backup functionality to Amazon Data Lifecycle Manager (Amazon DLM). Create a lifecycle policy for the daily backup of the EBS volumes. Set the retention period for the EBS snapshots to 30 days.