Azure Archive Storage

  • Store rarely accessed data which are held for a period of 180 days.
  • Snapshots are not applicable to archive storage.

Features

  • It supports 2 rehydrate priorities: High and Standard
    • Standard (Default) – rehydration request may take up to 15 hours.
    • High – rehydration request may finish in under 1 hour for objects under 10 GB in size.
  • Long-term backup, secondary backup, and archival datasets
  • Lowest storage costs but the highest data rehydrate and access costs
  • To read data in archive storage, you need to change the blob tier to hot or cold first.
  • Compliance and archival data that must be preserved and are hardly ever accessed.
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  • Archive storage only supports block blobs
  • If a blob is in the archive tier, it can’t be overwritten, unlike in hot or cool tier
  • Archive storage cannot be set as a default account access tier
  • Archive storage is initially available in selected regions.
  • Blob index tags can be read, set, or modified while in the archive.
  • You can only copy archive blobs within the same storage account.
  • Encrypted data transfer to the cloud using HTTPS, and using 256-bit AES keys to automatically protect the data at rest.

Use Cases

  • It is mainly used in long-term backup retention
  • If you need to minimize your cost, use Archive Storage to create a low cost, content archiving solution.
  • Archive storage provides secure, globally compliant storage for sensitive data.
  • You can also use Archive storage if you have a large amount of data that needs to be preserved.

Pricing

  • Blobs are stored for at least 180 days in the archive tier. Deleting or rehydrating archived blobs before the minimum number of days will incur early deletion fees.
  • Charges on data access increases as the tier gets cooler. For data in the cool and archive access tier, you’re charged a per-gigabyte data access charge for reads.

Sources:
https://docs.microsoft.com/en-us/azure/storage/blobs/storage-blob-storage-tiers?tabs=azure-portal
https://docs.microsoft.com/en-us/azure/storage/blobs/storage-blob-rehydration?tabs=azure-portal
https://azure.microsoft.com/en-us/services/storage/archive/

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