The documentation for the enqueue_transfer_item api functionality says: size integer The size of the content to transfer, in bytes. A valid positive integer. 123456789 The Transfers and Restores documentation says: The size of transferme.com is 123,456,789 bytes. It's not clear from the documentation what this means. I'm assuming that this is this the account disk space usage, not quota, but it would be useful if the documentation reflected that.