Unsual question about backup to external hard drive

Hi,
I have a large iTunes library on my laptop (+140GB). My hard drive is running out of space. I am planning on backing up my music and everything in iTunes to a backup 2TB external hard drive. I know how to do this but I like to tweek it a little: I want to be able to back up all my files to the external drive AND then delete some of the less-used songs on my internal drive. BUT i want to keep them in the external hard drive! Is this possible?
I know I am probably not clear, so please let me know.
Thanks,

I'd normally suggest this method for backing up.
You should always keep at least two copies of any file you don't want to lose.
tt2

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