I'd really love to backup all of my information because I am worried about a hard disk failure. It's happened to me before on my current machine, an iMac G5, and it happened less than a year after I bought it. They were able to save every folder with less than 250 contents, but I think I was lucky that time. The thing that really scares me now is that I have three external hard disks attached to it with significantly more and more important information. My 160 GB internal disk right now has 20 GB left, I have an 80 GB EHDD with maybe 7 GB left, my 100 GB EHDD has 40 GB left, and my monster LaCie .5TB disk has about 350 GB left. So that's roughly .5TB of data. My main hard disk is mostly general documents, music, and photos, as well as some of my older FCE documents. The other three are most, if not all, are FCS related files. I don't usually delete my original video files, even though I still have them on tape, because I never know when or how far I may have to go back and reuse some of my footage. Is Time Machine for me?