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Disk usage in Azure Vault vs AWS Vault

  • February 3, 2026
  • 2 comments
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Hello I have been working on Vault sizing for a customer, and I have seen that there is a significant space consumption difference between Azure Vault and AWS Vault, AWS having a large penalty on immutability overhead: with 83 TB VM to backup with 30 daylies, 30 days immutability, direct backup (no SOBR), 3% daily change rate, 10% yearly growth, 1 year horizon I get:

 

Azure Vault: 105,9 TB 13,7TB immutability overhead

AWS Vault: 133,3 TB 41,09 TB immutability overhead

(which very surprising since it means 133-41=92TB actual data)

 

Different storage rules in AWS or difference in the calculation in the sizer ?

Thanks for your inputs !!

Best answer by adamC

Hi! 

The answer here is Block Generation

AWS has a 30 day block generation while Azure has 10 days. If you take your 13.7 TB * 3 (10 * 3 = 30 days), you get the 41.1 TB (rounded). 

-AC

2 comments

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  • Veeam MVP
  • Answer
  • February 3, 2026

Hi! 

The answer here is Block Generation

AWS has a 30 day block generation while Azure has 10 days. If you take your 13.7 TB * 3 (10 * 3 = 30 days), you get the 41.1 TB (rounded). 

-AC


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  • Author
  • New Here
  • February 4, 2026

Thank you very much Adam !!