Hi,

You can backup the encryption key again through the Reporting Services Configuration Manager. You don't need to go through any of the other configuration steps.

Or you can use the rskeymgmt.exe command line utility.

e.g. c:\rskeymgmt -e -p <password> -f rskey.snk

I don't really know how to verify it, other then trying to restore it to the instance, it shouldn't overwrite anything though if the password is wrong.

Easiest to just back it up again and be sure you get your password right.