A research institute has 200 TB of scientific data stored on an on-premises NAS device.

They need to migrate this data to Azure Data Lake Storage Gen2. Their on-premises internet connection is only 100 Mbps, and it is heavily utilized by daily operations. They want to complete the migration within 2 weeks.

Which migration solution should you recommend?

This is a classic offline data transfer scenario. Transferring 200 TB over a 100 Mbps connection would take approximately 185 days (assuming 100% utilization). Since the requirement is 2 weeks, network-based tools (AzCopy, Data Factory) are impossible. Azure Data Box is a ruggedized physical storage appliance sent by Microsoft. You connect it to your local network, copy the data at high speeds, and ship it back to an Azure datacenter where it is uploaded to your storage account.