File copy to only copy files that are new or changed

[Gogi02]

I've tried that line of code

RunWait(@ComSpec & " /c " & "xcopy " & '"C:\Applications\AutoIt Scripts" "H:\Backup\Applications\AutoIt Scripts" /D /E /C /R /H /I /K /Y')

I even tried that:

Run("cmd.exe")

sleep(1000)

send ("xcopy c:\sample.txt c:\sample")

result is for both the same (described in post above). But it seems to work if i use copy instead of xcopy.

[gcue]

the problem im having with doing a large copy is that the gui seems to become unresponsive.. any ideas how to avoid that?