This free version of HDClone can be used to make an exact copy (or clone) of a hard disk (IDE/ATA/SATA).
A clone can come in useful in many ways, such as transferring your setup to a new PC (or hard drive), or making a backup of your stable setup.
Before you can use HDClone you'll need to create boot disk (CD or floppy), but full instructions on how to do this are included. This is then used to boot the PC in order to begin the cloning process.
Once you've created a boot disk, you simply restart your PC from this bootable disk and follow the on-screen instructions.
Copying speed is limited to around 300MB/min, but this isn't really a problem; just set it to do its job and go off and do something else.
Note the free version can only backup/clone to a larger drive.