@Jan Musial Thank you for reaching out to Microsoft Q&A.
Yes, it is possible to order Azure Data Box to transfer large amounts of data between two sites without uploading them to Azure cloud. You can use the Azure Data Box family of devices, which includes Data Box Disk, Data Box, and Data Box Heavy, to move large amounts of data between two sites when you're limited by time, network availability, or costs. You can copy on-premises data using tools such as Robocopy. Depending on the data size intended for transfer, you can choose from Data Box Disk, Data Box, or Data Box Heavy.
As per doc- https://learn.microsoft.com/en-us/azure/storage/common/storage-solution-large-dataset-low-network,
Data Box Heavy should be ideal for your use case. Hope this helps.
Please let us know if you have any more questions and we will be glad to assist you further. Thank you!
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