I am getting a WD passport for my mac, can i use it to back up windows and os x partitions? http://www.bestbuy.com/site/my-pass...skuId=9255071&st=wd my passport 2tb&cp=1&lp=1 it is that one. And after i use it for time machine, i am still able to store files correct? And can i also read files off of it? Sorry i know these questions are a bit... stupid I've just never had an external HDD before.