OK, I have an old MacBook pro (G4 Power PC). The hard drive is pretty full. I just bought an external drive. What I want to do, is backup the Mac hard drive to the external drive and leave it on the external drive (so my Mac Harddrive will be 100% empty), but still be able to open and access all the files, documents, etc. Pretty simple question. I thought I knew what to do, but reading around made me second guess, so I thought I'd ask. Thanks!