Super Duper by Shirt Pocket Software, www.shirt-pocket.com, is free if all you want to do is clone one hard disk to another. But if you register your copy, for $19.95, great new features appear, including filters, scripts and the amazing Safety Clone, which lets you install new software and still roll back your drive to the way it was if things go wonky.

And Shirt Pocket’s customer service is superb. When I was unable to register my copy, I sent an e-mail on a Friday night, and the solution was in my mailbox Saturday morning.

(via Dr. Mac’s column in the Houston Chronicle, Thanks, Dr. Mac!)