Hi, I just purchased a new external hard drive (G-drive 4TB Desktop drive) to back up my 2014 MacBook Pro Retina, running OS X Yosemite. I started the initial back up roughly 6 hours ago and it has transferred a total of 8GB (from 490GB). Transfer is through USB 3.0. It's a completely new disk so the full 4TB is available. I am aware that it's a large transfer, but it seems to be exceptionally slow. Is this very slow speed for an initial large back up normal? I have been using TimeMachine for years and the transfer rate has previously been much faster (although this was for the incremental backups). Any advice would be greatly appreciated. Thanks.