In environments that use and alter PC with high frequency (such as company PCs, school computers room, Internet cafes), it's necessary to make computer OS restore its original state at each reboot or specified time. Because compared with reinstalling and setting up the system over and over, its advantage is self-evident. This case, in addition to utilizing some hardware (PCI-E recovery card) to restore OS, your only best software solution is to use Deep Freeze such kind of reboot-to-restore tool. Its capability far surpasses programs like Returnil Virtual System and Shadow Defender.

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.