Azure Data Box is a physical device that is requested for a short period of time from Microsoft and which can be used as object storage that can be temporarily attached to your Veeam Backup & Replication backup infrastructure.
Such a device might become useful when you need to offload a large number of backup files that are occupying a lot of storage space on your extents, as offloading data to the Azure Data Box device occurs a lot faster that transferring the same amount of data directly to Azure object storage.
Once you have offloaded backups to Azure Data Box, you need to ship the device back to Microsoft for further data synchronization with your Azure storage account, as described in Seeding Backups to Azure Blob Storage.
Consider that Veeam Backup & Replication supports Azure Data Box devices that are capable of reading/writing data via REST API only; the Azure Data Box Disk type is not supported.
To add Microsoft Azure Data Box storage, do the following: