How do I find RDS Snapshot Incremental sizes for proper cost estimation ?
I understand that:
The first snapshot of a DB instance contains the data for the full DB instance. Subsequent snapshots of the same DB instance are incremental, which means that only the data that has changed after your most recent snapshot is saved.
Customer is taking 1 backup per day (aging out after 7 days). All of the snapshot are reported as full sizes. How can we identify the incremental sizes of each snapshot? This would provide additional details into how billing is done for backup storage more than the database size itself.
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Incremental snapshot sizes are not directly exposed to customers via API or Management Console. We only bill for the aggregate usage across all RDS snapshots. Customer can monitor the charged snapshot cost using AWS Cost Explorer. You may refer to the blog post: https://aws.amazon.com/blogs/database/amazon-rds-now-supports-detailed-backup-storage-billing/
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Then how can we estimate the cost if we are going to change retention period from 7 to 30?