I agree with TOOSLO.
I installed Pkgbackup which worked great.
I installed RockYourPhone and then when I tried to use Pkgbackup the program would ask me for my root password?
The developer for Pkgbackup emailed me directly and told me that RockYourPhone and Pkgbackup won't work together, not in the version I was running, (3.0.8). This continued to be non-functional until version 3.0.11. So I removed RYP.
(see below)
Date: Wed, 5 Aug 2009 12:23:55 -0400
Subject: Re: FW: Cydia/APT(M): PkgBackup (3.0.8)
From:
[email protected]
To:
[email protected]
Do you have Rock app installed?
Rock is a problem

...
I'll have a fix for it on the next iteration...
In the meantime, remove it