How can I clone my hard drive?

Rob has set up a new computer, and he wants to clone his hard drive before he does anything else, so he'll have a backup. Leo says that's a great idea. Windows 10 has its own imaging utility under backup. But there are other solutions:

Steve Gibson recommends Terabyte Image for Windows.

For the Mac, Leo uses SuperDuper. Nice thing about SuperDuper, he can create a bootable image.