Definitely do what rstoyguy suggested.
Pim.vol did not work on my Sprint Touch.
I copied it over to the storage card, and after a re-flash, copied it back to the device.
I reset, and then was unable to get a radio signal.
Strange problem, but that's what happened. I even tried reseting about 4 times.
Then, I deleted the pim.vol file, reset, and radio was back.
The device re-creates a pim.vol file for you.
I just did this as a test, because it would be quicker than using PimBackUp.exe.
It didn't work, so I'm sticking to the PimBackup program.
It's free to use and available here.
http://www.dotfred.net/PIM/PPCPimBackupV2.8_wm2005.zip
It's up to version 2.8.
Best part, there's no installation needed for Pimbackup.
It's an exe file that you can run from your storage card.
I keep a copy in the \storage card\Program Files folder.
When I need to make a back up, I just go to that folder and run the exe.