Question : XCOPY or COPY help

I need a script that will copy a complete directory from location A to location B.  The first time it runs it copies the whole thing.  After that it only copies new files or files that have changed.  Basically trying to build a script to backup 'My Documents' folder from hard drive to a USB drive and have it run once a week via scheduled tasks.

Answer : XCOPY or COPY help

elwayisgod.. u missed his last step

copy all robocopy files to c:\ for this script or modify it