Your post is confusing to read too.
It sounds like you still have your files on your Mac. Why do you want to back track to Snow Leopard on your Mac? Why can't you read your files from your Mac? If your files are on your Mac, why are you taking them off your broken Time Capsule? You don't have to install Snow Leopard to transfer your files back to your Mac. Maybe step back a bit and explain your situation a little better with details. For instance, what's a BAK drive? Suggest you explain what you are trying to do?
Before you do anything, create a backup of your Mac to another disk drive.. suggest you use Carbon Copy Cloner to make another copy of your Mac.
HELP! How do I remove Lion and reinstall Snow Leopard & my files
All my business records, files, word processor, data base, leases, speadsheets and mailmerge documents will
not function on LION because "POWER PC APPLICATIONS ARE NO LONGER SUPPORTED WITH LION."
My files are based on a POWER PC application!
There is no possible way to update power pc software to versions to go with Lion.
What I want to know is what steps are the best to revert to Snow Leopard with my last backup of Snow Leopard
files are on my usb external back up drive
Office 2004 is PowerPC, if you update to 2008 or 2011 then they won't be. Same is true for mst applications.
But as you seem to know things that I do not, carry on, I'll go to another problem.