Hi Sampath,
My name is Igor, it's a pleasure for me to help others and I'll do all my best to help you.
Robocopy questions it is more effective to ask at Q&A forum https://learn.microsoft.com/en-us/answers/quest...
It is oriented to admins and corporate users, they have much more experience with robocopy tool. This forum is oriented to home users, they use robocopy very rarely, so local experts may have no corresponding knowledge, sorry.