How to make Robocopy work

I am trying to automate the process of copying my pictures each day from my laptop to a USB drive.  The USB drive will have several Gb of images on it and the laptop will have a few hunderd Mb.  I keep some images on my laptop to work on for weeks.  What I want to do is copy files from my laptop to my storage drive if they haven't been copied before.

The code below is what I am running.  I copied this from an exchange expert post but it only runs for a sec and no log file seems to be generated.  I don't know where to start, as it seems, according to the manual that something should have happend.
All of my disks are formated NTFS

Any thoughts?
Thanks,

Brad

@ECHO OFF
SETLOCAL
 
SET _source=E:\All Music
 
SET _dest=F:\My Music
 
SET _what=/COPYALL /B /SEC /MIR
:: /COPYALL :: COPY ALL file info
:: /B :: copy files in Backup mode.
:: /SEC :: copy files with SECurity
:: /MIR :: MIRror a directory tree
 
SET _options=/R:1 /W:1 /LOG:MyLogfile.txt /NDL
:: /R:n :: number of Retries
:: /W:n :: Wait time between retries
:: /LOG :: Output log file
:: /NFL :: No file logging
:: /NDL :: No dir logging
 
ROBOCOPY %_source% %_dest% %_what% %_options%

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