At the same time, check to be sure the software is still being sold. If your software isn't made any longer, or a major upgrade has rendered your version incompatible with the current version, it's best to find that out before you have a problem. You should also maintain a list of a few vendors who supply the software and hardware, in case you need to replace them quickly. Last but not least, include a list of phone numbers for all persons responsible for the system. Keep this information in the safe with the backup tapes.
Most people also keep a copy off-site.
For the price of an additional tape, you'll sleep better at night. It, too, must be done regularly. Simply follow the vendor's instructions for your software's restore procedures. Restoring files is really just the opposite of backing them up and is part of the total downtime when a system malfunctions. The only difference is that when you restore files, you have the option of putting them in a different place from where they originated.