I clone using Casper 10 (and have used Casper for many, many years) - I currently run 3 hard drives in usb enclosures on a rotating basis and, if the need arises to resolve a serious issue, merely physically swap the drive in the laptop for one of the clones. Because the clones are exact bootable copies and all partitions are copied, the process is seamless and pretty-well foolproof. I do run an occasional system image to another drive but must confess I've never had to restore from that yet.