Is it possible to run robocopy in some sort of "completely silent" mode?
Any command-line utility can be made completely silent by redirecting stdout and stderr to the special file 'nul'. This is Windows' equivalent to /dev/null on *nix systems.
command >nul (stdout is not echoed) command 2>nul (stderr is not echoed) command >nul 2>&1 (neither stdout nor stderr is echoed)
The latter is the one you want to make it completely silent.