Below command is very useful to achieve high throughput on a copy process on Microsoft platforms (do play around with MT )
As the MT[:N] argument creates multi-threaded copies with N threads and will depend on your machines processor and memory configuration.
Example to keep to a local folder in sync with a remote source:
robocopy \\source\Calibre\eBooks\ F:\Calibre\eBooks /MT:64 /MIR /Z
Technet artice on RoboCopy here.
