Need help finding a backup solution.

What I have: Late 2011 MBP w/ 16Gb RAM and 512GB M4 SSD running 10.8. Also have the original 500GB HDD in a firewire enclosure.

What I need: An encrypted backup that I can boot using Target disk mode.

I have looked at superduper, CCC, and TimeMachine. I'm not sure any of these will do that.

Thanks for your help.

-Rouphis