What is Azure Archive Storage?
Azure Archive Storage is the lowest-cost storage tier within Azure Blob Storage, optimized for data that is rarely or never accessed. The service is ideal for compliance archiving, long-term backups, and cold data that must be retained for years or decades.
Data in the Archive tier is stored offline. Before access, it must be rehydrated to an online tier (Hot or Cool), which can take several hours.
Core Features
- Extremely low storage costs (starting at approx. $0.00099/GB/month)
- Automatic lifecycle management policies for tier transitions
- Immutable storage for WORM compliance (Write Once, Read Many)
- Integration with Azure Data Lake Storage Gen2
- Flexible rehydration options (Standard or High Priority)
Typical Use Cases
Compliance and regulation: Retention of business documents, emails, and transaction data according to legal requirements (GDPR, SOX). Immutable storage prevents subsequent modifications.
Backup archiving: Long-term retention of backup data that is rarely needed after the initial retention period but must remain available for compliance reasons.
Media and entertainment: Archiving of raw footage, finished productions, and historical content that is only retrieved when needed.
Benefits
- Up to 90% cheaper than Hot Storage for rarely accessed data
- Automated data lifecycle management reduces manual work
- Same durability (99.999999999%) as other Azure Storage tiers
- Seamless integration into existing Blob Storage containers
Frequently Asked Questions
How long does data rehydration take?
Standard rehydration takes up to 15 hours. With High Priority rehydration, data under 10 GB can be available in less than one hour, though at higher cost.
Is there a minimum retention period?
Yes, data in the Archive tier is subject to a minimum retention period of 180 days. Early deletion or tier changes incur early deletion fees.
How does lifecycle management work?
Lifecycle Management Policies allow you to define automatic rules that move blobs between Hot, Cool, and Archive based on age or last access time.
Is Archive Storage suitable for disaster recovery?
Due to rehydration time, Archive Storage is not suitable for fast disaster recovery. For critical systems, a combination of Hot/Cool Storage for recent backups and Archive for older data should be used.
Are there cost pitfalls with many small files?
Yes. Starting July 1, 2026 for new storage accounts (and July 1, 2027 for existing accounts), a minimum billable object size of 128 KiB per object applies to the Cool, Cold, and Archive tiers. Very many small files therefore cost more than their actual size; consolidating small files before archiving is recommended.
Integration with innFactory
As a Microsoft Solutions Partner, innFactory supports you with Azure Archive Storage: storage architecture, lifecycle policies, compliance requirements, and cost optimization.
Note: All product information on this page has been compiled with care, but is provided without guarantee and may be outdated or incomplete. Cloud services evolve rapidly — features, pricing, SLAs, and availability change frequently. Authoritative and up-to-date information can only be found on the official product page of Azure (official documentation). This page does not represent an offer by Azure.
