You cannot assume that files or data stored on your computer are permanent. Computer is a highly vulnerable medium that can cause loss of information at any point of time. Say you are working on an important project or a presentation, and suddenly your computer crashes leaving behind the blue screen of death. No matter you try hard to retrieve your files, you may be left empty handed and the situation runs out of your control. Hundreds of hours spent on preparing project documents, presentations, assignments or any other files may be lost in moments. On investigation, you may find the reason of damage could be power failure, virus, software corruption etc. But, if you don't have backup in such trying circumstance, you would need to recreate them or do without.
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