How to Clone Hard Drive

Windows already comes with a great tool for disc cloning, Robocopy.

To use it, start the command prompt.
Here is an example to clone disc M to N:
cmd> robocopy.exe /r:2 /w:1 /dcopy:t /mir /v /log:mn.txt m: n:

Explanation:
/R:n : Number of Retries on failed copies - default is 1 million.
/W:n : Wait time between retries - default is 30 seconds.
/DCOPY:T : Copy Directory Timestamps.
/E : Copy Subfolders, including Empty Subfolders.
/V : Produce Verbose output log, showing skipped files.
/MIR is an option to ROBOCOPY where you mirror a directory tree with all the subfolders including the empty directories and you purge files and folders on the destination server that no longer exists in source. 

It will also copy the exact dates of files and directories,but you can adjust it if you want.

You can also make a shortcut to this command on your desktop. Then you can start your backup whenever you want to.

More about hard drive clone, you can learn from http://www.disk-partition.com/windows-8/clone-hard-drive-windows-8.html