Block storage and its backups are easy to forget, and they keep costing money every month whether anyone uses them or not. Amazon Elastic Block Store (EBS) volumes are billed for provisioned size (and, for some types, provisioned performance), not for what is actually used, and snapshots are billed for the data they store. A handful of habits typically removes a large share of EBS waste without affecting performance, and the exam tests each of them.
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