Backup 

This term means “safety copy”, so do it as often as possible, to have an option in trouble. Computers "crack" sometimes because of operating system errors, sometimes due to a physical failure of any vital components, or even because of any current banal feathers, and there is risk to lose data hard disk. If you have important data on your hard disk, make sure you backup them regularly. From time to time (especially if these files change), renew the copy! You can copy important files on DVDs, and if the volume of data is higher, you can backup to another hard disk or on another computer.