How can I back up the itunes music on my desktop using the 'home sharing' thing?

My desktop is SO old it wont recognise the external hard drive i just bought (500GB). It doesn't recognise anything over 30GB.

The problem is, because it's old it is about to completely shut down, and i want to save my hundreds of dollars worth of music before that happens.

I figure i can use the home sharing program on itunes to transfer the music onto my hard drive (through my laptop) but was wondering how i do this? how do I make sure im getting the complete 'file' and not just making a copy the song?

Thanks
 
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