bootable clone

How do I make a bootable clone? In 2010 I built a tower primarily to run FAH (Folding at Home) and to use as a media/general server with the following components:- CORE I7 860 2.8GHz (mildly overclocked to 3.4GHz) GIGABYTE GA-P55M-UD4 P55 ASUS EN8400GS SILENT/P/512MB 2Gx2 CORSAIR...