Looking, for backup purposes with Time machine, at the Seagate 1TB Backup Plus portable HDD model STBW1000102 available in my local UK Apple store ..However, I have also noticed at UK Amazon the Seagate STBU1000201 which seems to me pretty much identical. Could anyone advise if I could purchase the STBU drive (some £30 cheaper!) for my needs, Time machine, Mac compatible etc. I Have the late 2012 iMac (27) with 1TB and 128 fusion. Or are the two drives more different than meets the eye? Thanks people.