If not you noticed yet, in all the fw dex is missing the option that allows you to make backup of your hd...( aka "backup utility": PS3™ | Backup Utility )
We of ps3ita found a way to restore Backup Utility in PS3 DEX:
Just install and start this pkg: http://uploading.com/files/get/5dd48...up_utility.pkg
There is also a pkg for uninstall http://uploading.com/files/get/c7ff8...up_utility.pkg, this is because if the option backup utility does not uninstall many options are not displayed in "debug settings"
Oh I forgot has only been tested on fw/cfw 3.55 DEX