Blob storage guidelines

Question

Hello, I would like some guidance on restoring data from archive tier blobs. I have some very rarely data in archive tier. Today I had to restore a folder, I rehydrated to cool and downloaded the data. But now that it's on hand I want to put the data back to the archive tier. If I used the hot tier instead of cool could I restore it back to archive tier immediately? I would also like to avoid being penalized for moving storage tier in less than 30 days. Guidance around managing data after restoring would be appreciated.

Answer 1

Hi Catheryn Kidwell,

Thanks for reaching out in Microsoft Q&A forum,

If I used the hot tier instead of cool could I restore it back to archive tier immediately? I would also like to avoid being penalized for moving storage tier in less than 30 days. Guidance around managing data after restoring would be appreciated.

You can safely return your restored data to the archive tier right away, even if you upload it to hot first, without triggering any 30-day penalties. Just follow a simple workflow to keep costs low and avoid issues.

Steps:

Upload the folder directly to the Hot tier (not Cool), verify your data is intact, then immediately change it to Archive using the Azure portal, CLI, or PowerShell. Hot tier has no minimum storage duration, so there's no early deletion fee when moving to Archive.

Here's the CLI example for a single blob (adapt for batch):

az storage blob set-tier --account-name <storage-account> --container-name <container> --name <blob> --tier Archive --auth-mode login

For folders, use az storage blob upload-batch to Hot first, then bulk set-tier.

No Penalties Hit You

• Hot → Archive: Instant and free of fees (no 30/90/180-day minimums apply here).
• Cool would penalize: If you'd gone Cool → Archive within 30 days, you'd pay prorated Cool storage for remaining days.
• Your original rehydration to Cool was fine for download; now treat this as fresh data in Hot.

Post-Restoration

Keep rarely accessed data in Hot briefly (minutes) for checks, then archive. Set up lifecycle policies to automate Hot > Archive after 0 days for future-proofing. Monitor bills in Azure Cost Management to confirm no surprises.

Official Docs:

• Blob access tiers overview​
• Archive a blob​
• Set blob tier

Kindly let us know if the above helps or you need further assistance on this issue.

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