How do I use dedicated storage and iTunes?


Ok, I'm missing something here. I am using iTunes w/AIFF files for my digital audio. I'm using a Mac mini (my regular computer) and streaming the files through Airport Express to an upsmplaing DAC (Cambridge Audio DacMagic) to my stereo. The problem is: I'm running out of space on the computer. How do I get my iTunes onto a dedicated external hard drive for media storage and then streamed to my system?
I do have a 1 TB backup drive for my computer, but am not sure how to get the iTunes off my mini and onto it or another dedicated drive.
128x128tarraga
do you have Apple support ? They walked me through the steps by phone . Took half an hour . Lots of steps .
Thanks. I guess the issue also is what is the best what to store it: NAS, separate hard drive, etc.?
I was recommeneded using a seperate ssd drive by Oyen called minipro . it was $170 shipped . very small almost the size of a deck of cards . 1tb . Owner of db labs has took all the guess work out of setting up a macmini for optimal performance . Great forum discussions on audiocircle he was a part of .