Azure Container Registry charges a fixed daily fee based on the selected tier — Basic, Standard, or Premium — regardless of whether the registry is actively used. This means a registry with zero image pulls, zero pushes, and no active workloads consuming it still incurs the same daily charge as a heavily utilized one. Teams commonly provision Standard or Premium tiers as a default "production-safe" choice without evaluating whether the advanced capabilities exclusive to those tiers — such as geo-replication, private endpoints, content trust, or zone redundancy — are actually needed. The result is a persistent overspend on tier fees that deliver no incremental value.

This waste pattern is especially prevalent in organizations with decentralized container workflows. Registries created for short-lived projects, development and testing environments, or CI/CD pipelines are frequently left running long after their purpose has ended. Because Azure Container Registry has no free tier and cannot be paused or stopped — deletion is the only way to cease billing — these forgotten registries quietly accumulate fixed charges indefinitely. Across an organization with dozens of registries spread across teams and environments, the compounding effect of idle or over-tiered registries can represent a meaningful and entirely avoidable cost.

In November 2025, AWS introduced an Archive storage class for private ECR repositories, marketed as a way to reduce storage costs for large volumes of rarely used container images. However, Archive storage pricing is identical to Standard storage pricing for the first 150 TB per month. Below this threshold, Archive provides no storage savings yet introduces a per-gigabyte retrieval charge, a retrieval delay of up to 20 minutes, and a 90-day minimum storage duration. Adopting the Archive storage class before meeting the 150 TB threshold means paying the same storage price but taking on additional fees and operational overhead.

This inefficiency is easy to miss because the AWS announcement emphasized cost savings for "large volumes" without quantifying "large" or prominently disclosing the retrieval charge or the minimum storage duration. In other AWS services, optional storage classes typically offer a storage price reduction from the first byte, in exchange for access penalties. With ECR, however, access penalties apply as described, but the storage price is unchanged for the first 150 TB, a container storage volume that few organizations achieve.