Back up your system with out CWM !
hello XDA ...
I'm gonna to tell you how to back up your system with out a recovery or any thing
FlashTool you can download it from here
first enable USB debuging
open the FlashTool (if your windows is 64-bit use FlashTool64 to work more smoothly)
click "help" --> "auto level" --> "debug"
Then click --> "Devices" --> "Import" --> and chose "C660X - sony xperia z"
Now a massge will be shown on your phone click "OK" .
now click --> "My C660X" --> "Backup system apps"
go and make a sandwich these may take some minutes
After the Flashtool finishs go to my C:\Flashtool\custom\mydevices\YT910CGC1R and you will see your system apps , you are done
If I helped you please click button