I am trying to do a time machine backup for my rMB as I want to switch back to a rMBP but it's taking extremely long. 2gb out of 38gb have been transferred in the last 4 hours or so. I i am using the USB-C to HMDI/USB adapter and a LaCie external drive with its own power supply. Is this normal? Is the adapter slowing things down and is there any way to speed it up? I can't wait 2 days for the backup to complete.