Object Storage

Veeam Backup for Microsoft Azure compresses all backed-up data when saving it to object storage. The compression rate depends on the type and structure of source data and usually varies from 50% to 60%. This means that the compressed data typically consumes 50% less storage space than the source data.



Average size of backed-up data

40%–50% of source data

Compression rate



Object Sizes

Depending on whether you choose to keep backed-up data in short-term or long-term storage, Veeam Backup for Microsoft Azure saves different objects to Azure blob containers.

Object Type

Block Size

Backup data (hot and cool tiers) 

1 MB (compressed to ~512 KB)

Backup data (archive tier) 

512 MB


4 KB (per 1 GB of VM source data)


Storage Account Limits

Storage accounts have throughput limits that vary per region. It is recommended to configure multiple repositories for a single Veeam Backup for Microsoft Azure deployment, or even, in some cases, one per policy. This changes regularly, currently these limits are:



Default maximum request rate per storage account

20K IOPS (~512 KB block size)

Default maximum write speed in large regions 

60 Gbps

Default maximum write speed in other regions 

25 Gbps

Default maximum write speed for legacy storage accounts 

10 Gbps


Cost Estimation

Veeam Backup for Microsoft Azure comes with a built-in cost calculator that allows you to estimate your Azure expenses. It uses publicly available Microsoft Azure price lists, so it may not reflect your exact cost in case of custom pricing or an enterprise agreement. Full details can be found at the cost estimation step of the Add Policy wizard.