There is never a homebrew fix for clicking drives and it's only a financial decision where the files are worth the recover fees from drivesavers.com or others.
Beware that advice of changing the circuit board of the drive. You may hamper the recover house's work and increase the fee.
Can I ask where the backup copy of the files you can't lose are?
I have a bit of a problem, my hard drive recently started clicking and I am not able to start up Windows Xp without completly disconnecting the drive. The drive is a Maxtor DiamondMax Plus 9 and I was wondering if the hard drive is fried? I have almost 120 Gigs of data on the drive and don't really want to format it, but I will if I need to. I don't want to spend alot of money getting it fixed either. I really just want to pull pictures off the drive.