Hi guys, How long should 600 GB of data take to backup on an external hard drive? My Time Machine says 22h, encrypted! Is this normal, or maybe my external hard drive is somehow slow? It's a new Seagate Backup Plus Ultra Slim 2Tb, USB 3.0. Curious to hear from you. I have a 2012 Macbook Pro with a standard 500 GB HD Hard Drive and 250 GB of a new SSD.