Very often it so happens that the information or data we store on the computer gets damaged, failed or corrupted. The data may be difficult to be retrieved. Back up is needed when files you are working with particular files and folders and they are deleted by accident or failure. Sometimes there is a hard disk failure. Sometimes there is a virus infection on your computer which deletes the data from the computer. Sometimes there is a mishap in the house or a natural disaster or theft or such other situations. In all such cases, Computer Backup Software is needed.