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An AWS Glacier vault is the archive container used by the separate, older Amazon Glacier service. S3 Glacier is a different model: its Instant Retrieval, Flexible Retrieval, and Deep Archive classes store objects in Amazon S3 buckets. AWS recommends the S3 Glacier classes for new long-term data. Choose among them by how often you will read an object, how quickly a restore must finish, how long you will retain it, and how object size and retrieval volume affect the bill. Vault archives do not provide normal S3 bucket features, so treating the two services as interchangeable can lead to the wrong workflow and unexpected restore delays.
What is an AWS Glacier vault?
An AWS Glacier vault is a container in the separate Amazon Glacier archival service. You place archives in a vault rather than objects in an Amazon S3 bucket, and you retrieve those archives through Glacier operations. The vault service is a legacy option for long-term storage; AWS documentation says, “We recommend using the S3 Glacier storage classes within the Amazon S3 service for all of your long-term data.”
Vaults are not simply another S3 storage class. The separate service does not provide S3 bucket features, and its console does not support the same upload and download experience as Amazon S3. Existing vault users should therefore treat vault operations, permissions, inventory, and any migration work as a separate project rather than assuming an S3 lifecycle rule will manage the data.
Is Amazon Glacier the same as S3 Glacier?
No. The names describe related archival technology, but the storage models and management interfaces differ.
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| Characteristic | Amazon Glacier vault | S3 Glacier storage classes |
|---|---|---|
| Container | Glacier vault | Objects in an Amazon S3 bucket |
| Service model | Separate legacy archival service | Storage classes managed through Amazon S3 |
| S3 bucket features | Not provided | Available through the S3 object and bucket model |
| Recommended for new long-term storage | No | Yes, according to AWS documentation |
| Typical access operation | Glacier archive operations | Immediate read for Instant Retrieval, or an S3 restore request for the other two classes |
The distinction matters when you design permissions, lifecycle policies, applications, and recovery procedures. A team that stores new data in S3 should normally select an S3 Glacier class instead of creating a new vault. The available migration terms for a particular existing vault account are account- and region-specific; confirm them in current AWS documentation or with AWS Support before planning a conversion.
Which AWS Glacier storage class should I use?
Use Instant Retrieval when an archived object must remain online, Flexible Retrieval when restores can take minutes to hours, and Deep Archive when access is rarer and a wait of up to two days is acceptable. The following figures are AWS service characteristics and typical retrieval times, not independent benchmarks.
| S3 Glacier class | Suitable access pattern | Access model and typical retrieval | Minimum storage duration | Object-size or metadata consideration |
|---|---|---|---|---|
| Instant Retrieval | About once per quarter | Object remains online; access in milliseconds | 90 days | 128 KB minimum object size |
| Flexible Retrieval | About once or twice per year | Restore required; expedited 1–5 minutes, standard 3–5 hours, or bulk 5–12 hours | 90 days | 40 KB additional metadata per object |
| Deep Archive | Less than once per year | Restore required; standard within 12 hours or bulk within 48 hours | 180 days | 40 KB additional metadata per object |
All three classes are intended for long-lived archive data, but they make different trade-offs. Instant Retrieval behaves like online storage for reads, while the other classes keep the object archived until you request a temporary restored copy.
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Choose Instant Retrieval for material that is retained for a long time but may be read around quarterly and must be available without a restore job. Millisecond access removes the scheduling step required by the colder classes. The 90-day minimum and 128 KB minimum object size mean that very small, short-lived objects can be a poor fit.
When does Flexible Retrieval fit?
Flexible Retrieval suits archives accessed roughly once or twice a year when a restore delay is acceptable. It offers three retrieval modes: expedited, standard, and bulk. Bulk retrieval is free, but the expedited tier is subject to demand; AWS recommends provisioned capacity when predictable expedited timing is operationally important.
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When does Deep Archive fit?
Deep Archive is aimed at data read less than once a year. It has the longest minimum duration and the slowest restore options, but it is designed for retention horizons where an application can wait for a scheduled recovery window. There is no expedited Deep Archive tier.
How long does an S3 Glacier restore take?
Restore time depends on the class and retrieval tier. AWS describes these windows as typical rather than guaranteed service-level commitments.
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| Class and tier | Typical completion time | Important qualification |
|---|---|---|
| Flexible Retrieval — expedited | 1–5 minutes | Availability depends on demand; provisioned capacity is recommended for predictable expedited restores |
| Flexible Retrieval — standard | 3–5 hours | Typical duration |
| Flexible Retrieval — bulk | 5–12 hours | Bulk retrieval is free |
| Deep Archive — standard | Within 12 hours | Typical duration; no expedited tier |
| Deep Archive — bulk | Within 48 hours | Typical duration |
Plan downstream jobs around the completion window rather than a single promised timestamp. For a disaster-recovery runbook, a standard or bulk request may be appropriate when cost matters more than speed; an interactive incident may justify Flexible expedited retrieval if capacity is available.
How do I retrieve data from Glacier Deep Archive?
A Deep Archive object is not readable in real time. You initiate a restore, wait for AWS to prepare a temporary accessible copy, use that copy during the requested retention period, and then allow it to expire.
- Locate the object in its S3 bucket. Confirm the bucket, key, version if applicable, and the object’s Deep Archive class before submitting the request.
- Start a restore request. The S3 console, S3 Batch Operations, the REST API, an AWS SDK, and the AWS CLI can all initiate a restore. Select the retrieval tier and specify how long the restored copy should remain available.
- Wait for completion. Standard requests typically finish within 12 hours and bulk requests within 48 hours. Do not have an application assume that the object is readable immediately after submission.
- Process or download the restored copy. The restored copy is accessible through S3 for the duration you requested. Account for any retrieval, S3 Standard temporary-storage, and data-transfer charges associated with your workload.
- Let the temporary copy expire. When the requested period ends, AWS removes the accessible copy. The original object remains in Deep Archive; a restore does not change its storage class.
The same sequence applies to Flexible Retrieval, with its expedited, standard, and bulk choices. For repeated recovery jobs, record the restore duration and tier in the runbook so operators do not accidentally request a short-lived copy for a process that runs later.
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What does Glacier archival storage cost?
A class cannot be ranked as simply “cheapest” without the region, object count and size, retention period, transition volume, retrieval tier, request volume, and data-transfer destination. AWS pricing pages and the AWS Pricing Calculator should be used with those inputs rather than an uncited dollar estimate.
Minimum-duration and early-deletion charges
Instant Retrieval and Flexible Retrieval have 90-day minimum storage durations. Deep Archive has a 180-day minimum. Deleting or transitioning an object before its class minimum can create a prorated early-deletion or early-transition charge, so lifecycle rules should reflect the actual retention policy.
Metadata overhead for colder classes
Flexible Retrieval and Deep Archive add 40 KB of metadata per object. AWS charges 32 KB at the archive-class rate and 8 KB at S3 Standard rates. On millions of small files, that overhead can materially change the effective stored size and cost even when the payload itself is tiny.
Retrieval and temporary-copy charges
Restoring an object can add retrieval charges. The temporary restored copy also incurs S3 Standard storage charges for the requested period, and data transferred out of AWS can create additional charges depending on destination and region. Include transition request charges as well when a lifecycle policy moves large numbers of objects.
How should I design S3 lifecycle transitions for archival data?
Use lifecycle rules to move objects into an appropriate S3 Glacier class only after they have reached the age and retention point that your access pattern supports.
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- Set the class from the expected read frequency. Quarterly access points toward Instant Retrieval; annual or twice-yearly access points toward Flexible Retrieval; rarer access points toward Deep Archive.
- Filter by object size. AWS advises considering object aggregation and filtering lifecycle transitions by size because per-object metadata is significant for small archives.
- Keep minimum durations in the policy design. A rule that transitions or expires data before 90 or 180 days can trigger prorated charges.
- Estimate restore demand. Model both routine retrievals and a larger recovery event, including the chosen tier, temporary-copy duration, and any transfer out of AWS.
- Test the operational path. Verify that the team can identify objects, submit restores through its chosen interface, wait for completion, and consume the temporary copy before relying on the policy for compliance or disaster recovery.
What mistakes cause Glacier archive problems?
Confusing a vault with an S3 class
A vault is part of the separate legacy Glacier service. S3 Glacier classes live in S3 buckets and use S3 management tools. Verify the service shown in your account before writing procedures or permissions.
Assuming every archive is immediately readable
Only Instant Retrieval is online. Flexible Retrieval and Deep Archive require a restore request, and the request’s typical completion window depends on the selected tier.
Using expedited retrieval as a guarantee
Flexible expedited retrieval is advertised at 1–5 minutes, but AWS notes that availability is subject to demand. Provisioned capacity is the option AWS points to when predictable expedited timing is required.
Ignoring small-object overhead
The 40 KB metadata allocation on Flexible Retrieval and Deep Archive applies per object. Aggregating related small files before archival, where application and compliance requirements permit, can reduce that overhead.
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Forgetting that restore is temporary
A restore exposes a temporary S3 Standard copy and leaves the source in its archive class. Applications that need recurring access should either request restores on a schedule or reconsider whether Instant Retrieval is a better fit.
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Publishing a universal price comparison
Storage and request rates vary by region and workload. A valid estimate must include object sizes, count, retention, transitions, retrieval volume and tier, temporary-copy duration, and egress rather than presenting one global price.
What should an existing vault owner check before changing services?
First inventory which data is in vaults, how it is protected, who can retrieve it, and what retention or legal-hold rules apply. Then review current AWS account- and region-specific documentation for migration terms and operational status; those details are not universal. Do not delete vault archives or build a replacement S3 lifecycle policy until you have validated a representative retrieval and documented the new recovery process.
Frequently Asked Questions
Can I use S3 lifecycle rules with an AWS Glacier vault?
No. Lifecycle rules are an Amazon S3 mechanism for objects in S3 buckets, while a vault belongs to the separate Glacier service. A vault archive therefore needs its own Glacier-specific management process.
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There is no single conversion procedure established for every account and region. Check the current AWS migration documentation for your account and confirm the plan with AWS Support before moving or deleting archives.
Are restore charges the same as data-transfer charges?
No. Retrieval pricing, the temporary restored copy’s S3 Standard storage, and transfer out of AWS are separate cost considerations. Use the AWS pricing calculator with your region, destination, retrieval tier, and expected volume to model them together.
Why can millions of tiny archive files cost more than expected?
Flexible Retrieval and Deep Archive apply 40 KB of metadata to every object, including 32 KB billed at the archive rate and 8 KB at S3 Standard rates. Aggregating related files or excluding very small objects from a transition can improve the effective economics when your application allows it.
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