Snow Leopard. I have one external drive setup with Time Machine. If I wanted to connect a second drive to selectively backup some folders just for extra security can I configure Time Machine to work with two drives- one for the full backup and one for just selected folders?- or do I need to use another backup program for the second drive? Would using a non proprietary backup program (like saving in .zip) give me more flexibility? I do not plan to link or daisy chain these drives. They are separate.