We have five desktop computers with a 200G hard drive each. I understand to clone I can buy an equal or bigger hard drive and run Acronis to do the cloning. But I remember instead of cloning to an individual separate hard drive I can "image" each of five hard drives to, say, one USB hard drive of 4 TB. In case one computer's hard drive broken, I can restore from the image to a new hard drive.
Can you tell me how to do that? and what software do I need?