If you've got the click of death, then pretty much nothing short of sending it to a recovery house will get the data back. That can cost several thousand dollars, depending on how much data is to be recovered.
One thing you can try, is stick the drive in the freezer for about 15 - 30 minutes, then quickly put it back in the computer, and try to boot. You might get some functionality out of it for a few minutes, allowing you to back up some more stuff. If that doesn't work, you're pretty much shit out of luck.
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