I want to mirror/clone my notebook internal system drive A to an external device which is also my primary data drive B. So I want to backup the whole external device with another device C. What kind of hardware and software I need?
You might consider using an external 2 1/2 inch hard drive as a backup since there is no power supply needed when used through the USB port. Drive Image 7 will both copy or image the hard drive.
The backup device doesn't have to be portable and I perfer 3.5" harddisks. With some searching I now refine my question to what DUAL DRIVE RAID ENCLOSURES are good?
As it's possible for one agent to compromise both mounted HDs, you should also consider at least one external backup at all times.
if your notebook is connected to a network, you can try a NAS. http://reviews.search.com/search?q=nas&tag=srch&submit=Go!
Don't think anyone has mentioned the simple solution of sharing a folder on your desktops hard drive and just copying the files through the LAN on to the desktop. Every week I have my laptop send files to a hard drive in my desk top and vice versa. That way if one crashes, I will always have a good copy of my accounting files.