yes, just like any computer, it has a hard drive in it to save all the information.
i think you keep looking at it like a ipod, where you ned to constantly sync it to get it to play songs...
these systems are nothing like a ipod-- these are full blown computers-- like what you are probably using to surf the web with-- the only difference is that they are adapted to a car environment.
and you do not need to be locked into only the mac mini, any computer adapted correctly will work..
one other note: your 'bold' button is stuck on

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