To create a backup of your entire hard drive would be excessive for the average computer user. With computers having a bare bones setup of about 40GB, you would need burn about 100 CD's, and you would need 17,920 4MB flash drives ( though I think this is a typo and you actually have a 4GB flash drive in which you would need at least 10 more of those). Data transfer rates are slow with these forms of storage so to copy that much data would take hours. Usually, I simply suggest backing up only your important docuemtns.
You could buy a second hard drive and set up a RAID controller that continually backs up your data so that if one drive fails, you have another drive that is good.
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