iPod using superduper..need some help

Hi,

i've been using superduper to back my itunes onto an external HD.

i just noticed that my back up folder is larger than my itunes folder by quite a bit.

so i decided to check my script and i've got it set to 'not remove any files'.

i would like my backup to be identical to my main itunes folder.

any hints on how to script so any files I delete on my main itunes folder get deleted on my backup itunes when i backup?

hope this makes sense.

cheers,
keebler