Limiting Bandwidth Using Robocopy

Robocopy does not have any built in bandwidth limiter by rate specifically.

But what you can do is use the inner packet gap switch /ipg:n to simulate a lower bandwidth by adding more delay between packets.

The equation to use to calculate is as follows:

Where
D is the calculated latency or inner packet gap
Bd is the desired bandwidth you would like to transfer at
Ba is the available bandwidth to you

Example:
If my
Bd is 200kbps
Ba is 1000kbps

D=((1000-200)/(1000*200))*512*1000=2048


Therefore my /ipg:n will be /ipg:2048

References:
https://yellowtriangle.wordpress.com/2012/06/28/bandwidth-throttling-with-robocopy/
http://www.zeda.nl/index.php/en/copy-files-on-slow-links
https://technet.microsoft.com/en-us/library/cc733145.aspx