It’s wise to make backup copies of your original software in the event that the original is damaged. For the same reason, you should frequently back up important data while you are working. Save your work to the hard disk regularly (some programs do this automatically or offer auto backup as an option). More importantly, save the data to a backup such as a tape drive, disc or removable hard disk several times during each work session. If your hard disk crashes or a power failure destroys your file or your office is broken into, you will be thankful you did.
If your data is critical, it’s advisable to make a second backup and keep this in a fireproof safe or a safe location out of the office.