Hey, Just wondering for those of you who use a SD card for extra storage, what type of files do you put on it? What class of SD are you using and how big is the card memory? I feel like putting files like music or photos on the SD card might not be good because I'm not sure if time machine will backup the SD card and if the card corrupts then you lose all those precious files. But then those are the files that take up the most space. What do you guys think?