S3 Glacier
Family of three S3 cold-storage tiers, all under the `S3 Glacier` brand but with structurally different retrieval-latency profiles: - **S3 Glacier Instant Retrieval** — millisecond access, $0.004/GB/month, 90-day minimum - **S3 Glacier Flexible Retrieval** — 3-5 hour standard restore (1-5 min expedited at $0.03/GB premium), $0.0036/GB/month, 90-day minimum - **S3 Glacier Deep Archive** — 12-hour restore, $0.00099/GB/month (~$1/TB), 180-day minimum Plus 40 KB metadata overhead per archived object (billed at standard rates for Flexible Retrieval + Deep Archive). Best-in-cloud per-GB storage cost; the catch is retrieval cost + retrieval latency.
Definition
Family of three S3 cold-storage tiers, all under the `S3 Glacier` brand but with structurally different retrieval-latency profiles: - **S3 Glacier Instant Retrieval** — millisecond access, $0.004/GB/month, 90-day minimum - **S3 Glacier Flexible Retrieval** — 3-5 hour standard restore (1-5 min expedited at $0.03/GB premium), $0.0036/GB/month, 90-day minimum - **S3 Glacier Deep Archive** — 12-hour restore, $0.00099/GB/month (~$1/TB), 180-day minimum Plus 40 KB metadata overhead per archived object (billed at standard rates for Flexible Retrieval + Deep Archive). Best-in-cloud per-GB storage cost; the catch is retrieval cost + retrieval latency.
Long-term cold storage at hyperscale (compliance archives, completed-project archives, infrequent-disaster-recovery snapshots) has fundamentally different access patterns than hot storage — read once a year or less, but billed every month for years. Glacier's bet is to optimize the per-GB storage cost aggressively, accepting hours-of-latency on retrieval as the trade-off. The 2025 split into three tiers exists because operators kept wanting "millisecond retrieval at Glacier prices" — Instant Retrieval addresses that at the cost of being ~4× the price of Deep Archive.
Long-term compliance archives (SEC, HIPAA records with multi-year retention), disaster-recovery snapshots accessed once per year or less, completed-project data archives where the project is done but legal retention applies, ransomware-defense secondary backup tier (alongside Object Lock in Compliance Mode), and any workload where read-once-a-year amortizes the per-GB storage cost over the retrieval cost.
Recent developments
- Deep Archive at $0.00099/GB/month — ~$1/TB. Lowest per-GB storage cost among major cloud providers. Ideal for compliance data and long-term archives with minimal expected retrieval. Per LeanOps — Glacier's Trap pricing 2026.
- Retrieval-cost trap: $200 + 12 hours to restore 10TB from Deep Archive. The hidden cost trap is retrieval — restoring 10TB from Deep Archive costs $200 in retrieval fees plus 12 hours of waiting. Per LeanOps — Glacier's Trap.
- 40 KB per-object metadata overhead for Flexible Retrieval + Deep Archive. AWS charges for 40 KB additional metadata per archived object at standard S3 rates — bites when archiving billions of small objects. Per AWS S3 Glacier pricing.
- Minimum storage durations: 90 days (Instant + Flexible), 180 days (Deep). Objects deleted before the minimum-storage-duration window incur a pro-rated early-deletion fee equal to the remaining days at the regular rate — making rapid tier-promotion-and-deletion cycles economically unattractive. Per AWS S3 Glacier storage classes.
- 23× cost gap between hottest and coldest S3 storage classes. Per the 2026 storage-class comparison, the per-GB rate gap between S3 Standard and Glacier Deep Archive is ~23×, with Glacier Instant Retrieval at ~5× the price of Deep Archive but with millisecond access. Per Cloud Burn — 23× cost gap.
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