I'm sorry, but I'm not getting your question, but I'm answering what I think is your question. If your hard drive fails, get it replaced, come then plug in the HD with the time machine backups. Insert the leopard disk, or if you got leopard preinstalled, the restore disks, and start up the computer while holding down the C key. You will be led the leopard installation process. choose the correct language, then move on. On the next screen, goto the menu bar>utilities, then choose restore time machine, then you go on from there, I don't know what happens next cuz I never needed to restore my system after an HD fail, my Hd never failed fortunately so far🙂. If you lost a file on your desktop or whatever, open the app time machine when your in the right folder, then go "back in time" till you find the file, then click restore. But if you had the file on your desktop for like an hour, and 3 days later you can't find it in time machine, this is because TM ONLY Backs up hourly for the past 2 days, daily after 2 days have passed, and weekly once the HD is full. Hope this helps