Ok, so I do not want to have the drive bootable, I do not want any existing data destroyed on the target device, all I want to do is clone the hard drive to an external source, much like I could do with Acronis on the PC. Preferably with a GUI. Although command line is okay with clear instructions.
That way if anything really bad happens, instead of going through the entire process of re-installing OS, updates, installing programs etc etc, it's all there in one image!
I have searched google and although I have found many apps that propose they can do this, they actually cannot without meeting all the criteria above!
Does anyone here have any suggestions?