Originally Posted by s8n666
To get back to the original question asked....the answer is NO you cannot back up the jailbroken state. You will have to re-jailbreak after restoring.
So, if iPhone quits working then I have to restore "factory condition" as a message says when starting the restore, and then do JailBreaking and Tethering again. I wonder what exactly the Rock and the PkgBackup do which so far mentioned by other posters.