Help!!! Backing up Itunes files from Laptop to Desktop???

I have a laptop and my itunes library is on it and I want to back it up with a desktop computer that will be designated for my Itunes back up only. I have set up a workgroup with the laptop and the desktop on it and I can view both computers through the laptop. What and how do I transfer my Itunes library on to the... show more I have a laptop and my itunes library is on it and I want to back it up with a desktop computer that will be designated for my Itunes back up only. I have set up a workgroup with the laptop and the desktop on it and I can view both computers through the laptop. What and how do I transfer my Itunes library on to the desktop computer from my laptop for backup? I know I can just put the Itunes music file to the desktop computer from the laptop but I want to be able to add new music files to the desktop each time. By dragging and dropping the itunes files to the desktop computer it will just replace the itunes files on the desktop, in turn deleting the Itunes files already on the desktop computer. Is there a way to avoid this? Is there a way to just "add to" instead of overwriting what is already on the desktop computer?
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