I am using a batch file on a USB stick to backup my pictures. I use the following command:
for /r C:\\ %%x in (*.jpg *.png *.gif) do @copy /y %%x .
Drop COPY
and use ROBOCOPY which exists in Windows Vista+ & is downloadable for prior versions.
It supports /XD
to exclude specific directories & /XF
to exclude file masks at the command line.
E.g.
robocopy.exe c:\ c:\destination\ *.jpg *.png *.gif /xd "Program files" "windows" /S
(Note this will recreate the directory structure in c:\destination\, which thinking about it may not be what you want)