I just bought an external hard drive (My Passport for Mac) because my Macbook's hard drive is almost full. I did not want it necessarily for backup purposes, but rather I wanted to be able to store music, docs, etc. that I might want to access in the future, but want to remove from my computer for now. Should I use Time Machine? Will time machine let me access my hard drive to obtain certain files when needed? Or is Time Capsule's sole purpose to backup everything on my computer?