I have a 500 GB hard drive and I'm currently using it as a Time Machine back up drive + spare drive (I store some unimportant pics and mp3s there). Just wondering if over time (say, a year) will Time Machine consume all my empty space? I'd like to have it keep only XX period of data without eating all my precious 500 GB of space. Also, is there a way to partition my HDD while keeping the files intact without deleting them? Thx in advance.