Transferring large data sets (in the hundreds of terabytes and beyond) can be expensive and time-consuming over the public network. Google now offers a service that let’s you Disk Import offline !
Google announced via blog post saying :
To use offline disk import, write your data to HDDs and then ship them to a Google importcenter using a mail carrier. For security during shipment, the data on the HDDs must be encrypted. Upon receiving the shipment, Google uploads the data into an empty Cloud Storage bucket that you designate. Because the data is loaded directly via Google’s network, this approach may be faster or less expensive than transferring data over the Internet.
Offline Disk Import service will cost $80 per drive. With the initial launch it’s only available in the United States. Google has asked to fill up a form incase Offline Disk Import is required elsewhere.