Backup is very important term which you have leanerd several times from all around before installing a new software on your machine, before installing a new operating system, before moving data from one machine to an other machine, moving data from your home to your office and vice versa, Somtime this back system itself cause a problem for you when you have not backup in an organized way and you come accrose a multiple version of the same file, multiple files on your system, increased garbage on your hard drive. Read more at original post