I'm going to point that since he mentioned OS X, I'm assuming a Mac with a Boot Camp partition and to be wary of restoring a Windows clone to the Mac. Last time I did this with the built-in tools ...

And even standout Mac-cloning utilities such as SuperDuper and Carbon Copy Cloner are unable to make clones of your Boot Camp partition for migrating or restoring your Windows install.

First, I cloned the Mac partition with CarbonCopyCloner to clone the Lion installation and then I used WinClone for the Bootcamp partition under Lion. Everything worked perfectly.

Winclone is designed to help everyone who uses dual boot Macs with Boot Camp more easily create snapshots, clone partitions or migrate Boot Camp systems and more. New in Winclone 5 is Winclone Backup, ...