Restoring your system with a backup is extremely efficient and wise, because then you no longer have to "install a brand new system + install drivers + optimize/setup system + install all the common software". Otherwise, the whole process is extremely time-consuming, boring, and annoying. In fact, I haven't reinstalled my system in years, and have always used a backup of the system at its best state. This way, whenever the system appears all kinds of problems that are difficult to deal with, I just directly restore the system to its original best state.

Ghost (short for General Hardware-Oriented System Transfer) is an excellent backup & restore tool (commonly known as cloning software) for system, data on hard disk/partition developed by the famous Symantec company from America. For the vast majority of advanced users like system administrator/network manager, it is used to backup the system partition (so as to minimize the time and labor spent on each reinstallation of OS furthest) or data on a disk.