Robocopy

Hi I am trying to write powershell script for robocopy .

Requirement as below example 

Source(Server1)                Destination ( Server2) 

c:\backup\1                          d:\backup

c:\backup\2                          D:\backup

wrote script it works but now user requested some additions

Like 

Source 

c:\backup\1                          d:\backup\1 and other folder in same place like d:\backup\1_1 

c:\backup\2                          d:\backup\2 and other folder in same place like d:\backup\2_1

if i use more than one robocopy command it doesn't work , I am not great at powershell any help will be much appreciated