Migrate 2 PB of historical data from on-prem storage to Cloud Storage within six months with outbound bandwidth limited to 20 Mb/sec. Which migration method should you use?

Transfer Appliance is the most suitable method for migrating 2 PB of data within six months with a 20 Mb/sec bandwidth limit. This is because 2 PB at 20 Mb/sec would take approximately 25 years to transfer over the network, making network-based solutions impractical. Transfer Appliance allows for offline data transfer, bypassing bandwidth limitations. Using gsutil cp with compression or trickle/ionice would still rely on the limited 20 Mb/sec network connection, making the migration timeframe impossible to meet. Creating a private URL and using Storage Transfer Service also depends on network transfer, which is too slow for this data volume and bandwidth constraint.