Ahh, good old PC vs. MAC. I use Win XP so I guess I storage my music on PC.

Backups I have on external HDD.
I've always used Windows but I've tried OSX couple of times. It's probably just as good as Windows (or better!?) when you learn to use it but for the first time it's just as difficult as any other OS. When you're used to Win XP, everything seems incoherent on OSX.
I have nothing against MAC-people but I can't stand Apple fanatics who keep on dissing PC's and whining about Windows crashing down all the time etc. Every OS has its problems. I've learned to live with Windows' problems and I can handle them.