This is for any Jailbreak devices running IOS 7.01 to 7.06.
This is how I saved my jailbreak while restoring my iPad to a "clean" state. As you now, if you install and try tweaks eventually your iDevice will lag, respring, or slowdown. The last one was my reason to desperately try to save my Jailbreak.
You will need the following repo to install iLex Rat.
Open up Cydia and enter this:
Install iLEX R.A.T (IOS 7) the specialist beta
Install MobileTerminal from the BigBoss repo
Don't forget to change your SSH password.
Open MobileTerminal and type: rat (hit enter)
Here you can choose the option that works better for you. In my case it was number 12.
I typed "Y" as I did want all content and settings to be erased.
Eventually it will ask if you want to keep iLexRat (I chose yes). You can choose Yes or No, it is up to you and it won't affect the process. It will reboot your iDevice and when it finishes simply restore from iCloud or iTunes.
Hope this entry helps as much as it helped me.