Not sure whether to post here or in Peripherals, so I'll start here. I have a late '13 15" rMBP and an 802.11ac 2TB Time Capsule, directly connected by CAT6 cable (via an Apple Thunderbolt-to-Ethernet adapter). I never see Time Machine back up speeds over 20-21 MB/s (160-170 Mb/s) on a network that is theoretically capable of 125 MB/S -- usually lower. While I recognize that initial file transfer speeds are often slow (KB/s range), after the first minute or so they ramp up to the 10-20 MB/s range. I am also aware that real world never equals theoretical (overhead, signal/noise issues, etc.), but I was expecting a bit better than 15-20% of theoretical! As I often have my 40GB Parallels Win 8.1 file in the back up, TM backups can take a fair amount of time (I am aware that I can exclude the Parallels file, but do not wish to do so). So, is my experience "normal"? How do others' set-ups compare? Is it possible that I've missed a setting that would enhance the data rate?