I'm currently a windows user who is highly considering switching to a mac. I currently have a question regarding itunes and music. I currently only use itunes to update my iphone os. My question is this: when using itunes if i was to purchase a cd album and then reformatted my mac for whatever reason, upon reinstalling or updating itunes would my music that was purchased be there ie saved in my profile or in the cloud some where or would that be lost unless previously backed up? ie thinking in regards to virsuses or other things etc.