Making a backup on OS X
After I had unpacked the Western Digital My Passport I used Disk Utility on OS X to erase and format the drive as "OS X Extended (Journaled)".
Next, I selected the drive in Finder, selected "Get Info", unlocked the settings at the very bottom and turned "Ignore ownership on this volume" off.
Finally, I used
rsync in the terminal as follows
sudo rsync -avh /Users/ \ /Volumes/Orange/Users/
to start a complete backup of all Users data on the brand new Western Digital harddisk named Orange.
Transfer speed of a WD My Passport 2TB drive
When done with the backup of my OS X "El Captain"
rsync command reported a transfer speed of 34.72M bytes/sec for the
WD My Passport 2TB drive (output reformatted to fit):
sent 788.46G bytes received 13.34M bytes 34.72M bytes/sec total size is 788.81G speedup is 1.00