There is no universal per-terabyte price for backing up an Amazon S3 bucket. The total depends on where each copy lives, its storage class and retention period, how many objects and requests the workload generates, and how often data is restored. To estimate your bill, model those inputs for the relevant AWS Regions, then validate the estimate against actual billing data.
What goes into an S3 backup bill?
Amazon S3 charges can include more than stored bytes. AWS lists storage, requests, data retrievals, and data transfer as separate usage categories; enabled management and replication features can add costs too. Rates depend on the storage class, operation, Region, and usage. Consult the live Amazon S3 pricing page for the Regions and design you plan to use.
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- Stored data: Count every retained copy, its storage class, Region, and time in storage.
- Requests: Include operations performed by backup, replication, inventory, lifecycle, restore, and other configured features. A high object count can mean substantial request activity even if the total data volume is modest.
- Retrieval and restore: Some infrequent-access and archive classes charge for retrieval. Estimate realistic recovery volumes and frequency rather than assuming data will never be restored.
- Data transfer: Internet egress and cross-Region transfers can add charges.
- Optional features: Replication monitoring and Replication Time Control (RTC), if enabled, can add costs.
AWS says in the Billing section of its Amazon S3 FAQs: “With Amazon S3, you pay only for what you use. There is no minimum charge.” That does not make a backup free of ongoing charges: the bill follows the storage, requests, transfers, and features actually used.
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A second copy adds storage in its destination, along with the requests needed to create and maintain it. Which other charges apply depends on how and where the copy is made. AWS says same-Region data transfer between S3 buckets has no data-transfer charge; Cross-Region Replication (CRR) has inter-Region data transfer charges. Review AWS’s replication requirements and considerations alongside current regional pricing.
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| Design choice | Cost factors to model | Recovery and planning implications |
|---|---|---|
| Same-Region copy (SRR) | Destination storage, replication requests, and applicable retrieval charges. AWS says S3 bucket-to-bucket data transfer within the same Region does not incur a data-transfer charge. | Compare storage class and retrieval behavior with the recovery time your plan requires. |
| Cross-Region copy (CRR) | Destination storage, replication requests, applicable retrieval charges, and inter-Region data transfer. RTC and monitoring metrics can add charges if enabled. | Choose destination Region(s) to meet resilience and business requirements as well as cost constraints. |
The storage class and retention duration change both the amount stored and potential retrieval or minimum-duration costs. A less expensive class is not automatically the least expensive backup design if restore charges or timing requirements make it unsuitable. AWS’s guidance on designing a resilient and cost-effective S3 backup strategy discusses these trade-offs.
Why object count, retention, and recovery assumptions matter
Object count and request volume
Replication generates PUT requests, and backup or management workflows can create other billable operations. Estimate the number and size of objects, plus the expected operation volume, rather than multiplying bucket capacity by a storage rate alone. AWS’s S3 pricing page separates request and retrieval charges from storage.
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Retention and accumulated copies
Stored backup data accumulates as new recovery points are retained. Model how much data is added over time and how long each recovery point stays in each storage class. Include lifecycle transitions, minimum ages, and any retrieval consequences relevant to those classes. Expired recovery points and partial backups that are not cleaned up can continue to contribute to cost; AWS recommends accounting for cleanup in its S3 backup strategy guidance.
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Estimate the volume and frequency of likely restores, including the storage class from which data must be recovered. If you use AWS Backup, include backup storage, restore use, and the configured lifecycle or tiering behavior. AWS Backup tiering behavior and its cost implications are described in the AWS Backup Developer Guide; confirm current availability and charges for the account and Region you intend to use.
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A dated replication example—not a current quote
In an illustrative cross-Region example published on 2023-08-09, AWS Storage Blog reported $6.50 in replication request charges and $102.40 in data-transfer charges for a 5 TB bucket with 1.3 million objects, using the rates in that example. Those are historical example outputs, not current prices or a forecast for another workload. They show why request volume and inter-Region transfer should be modeled as separate line items. Use the live rates and your own inputs instead. See AWS’s step-by-step S3 synchronization example.
How to estimate your workload
Gather the following assumptions before using the AWS Pricing Calculator:
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- Source Region and each destination Region.
- Current and forecast data volume, object count, and average object size.
- Daily or weekly change and ingest volume, and backup frequency.
- Retention by recovery-point age and the storage class used for each copy.
- Expected restore volume and frequency, plus request volume for backup and management operations.
- Replication and monitoring options, and encryption or KMS patterns where relevant.
- Any applicable negotiated discounts or account and tax treatment.
- Enter the design and usage assumptions in the AWS Pricing Calculator, using the relevant services, Regions, and storage classes.
- Review storage, requests, retrievals, transfers, and optional feature charges as distinct cost drivers; revise the assumptions if they omit likely restores or long-term retention.
- After deployment, compare the estimate with actual S3 usage in AWS billing reports or Cost and Usage Reports. AWS explains S3 billing analysis in AWS Billing reports for Amazon S3.
Rates and free-tier eligibility depend on account, Region, and time. A calculator result is therefore an estimate based on its inputs, not a universal S3 backup price.
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What to check when actual costs differ from the estimate
- Storage is higher than expected: Check the number of retained copies, lifecycle transitions, retention periods, and whether expired recovery points or partial backups remain.
- Requests are higher than expected: Compare actual operation categories with assumed backup, replication, inventory, lifecycle, and restore activity. Object count can drive requests even when capacity is low.
- Transfer is higher than expected: Verify source and destination Regions and account for cross-Region replication or internet egress.
- Restore costs are higher than expected: Check retrieval activity and whether the selected storage classes match the recovery pattern you modeled.
- Optional charges appear: Confirm whether RTC or replication monitoring metrics are enabled, and include them if they are part of the intended design.
Use AWS billing reports or Cost and Usage Reports to inspect actual S3 usage categories, then update the calculator inputs to match the deployed workload.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
