!!! Backup & Restore Your OS Without Any Softwares !!! I have my own small way of backing up my HDD along with the OS without any softwares like Acronics TrueImage or Norton Ghost. Hope this can help... Create multiple partitions in your HDD... Install two OS in two different drives. Let that be Win XP in C: and Win 2K in D: as an example... Install WinRAR or any other compression software in both OS... Install all other softwares that you need to before taking a backup... Start Win 2K and take complete backup of Win XP Start Win XP and take complete backup of Win 2K Do remember to take the backup of all system and hidden files also or else all your efforts will be a waste. You can ofcourse drop the page files created by the OS while backingup your OS as your OS will create it again. It would be a good idea have atleast three partitions in your HDD, two for two OS and the third for all your data. Later whenever you feel there is a any kind of a problem with the OS or your system is getting slow, start the other OS and quick format the drive in which you have the faulty OS. Then all you have to do is unzip the file that you created with WinRAR and you are done. There is no hard and fast rule as to which OS you need to install. You can install any OS and even the same OS twice. Whenever you want to try any new software, first try it with your secondary OS and if satisfied, go for the main one. This will help you in keeping your main OS clean and will avoid regular restoring process.