I am looking for a full bit bit cloning software. The scenario is this. I am running some legacy software an an old XP computer, which is crucial for the business. I want minimal interruption to the business operations. If the hard drive crashes, I want the ability to boot from the external clone, which is an external USB HDD, and allow XP to boot from that device as if it was the internal original hard drive which just crashed. This way all I need to do is possibly make a change to the startup sequence in BIOS, then boot from the external so as to continue running the important software. Of course when possible I would replace the internal crashed hard drive with a new one, and then 'clone' the external to the internal one.
The cloning software (not imaging software) must have the ability to update the clone every so often, on schedule, say every night at 9 pm etc..