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Buy a backup computer - any model. Install the DB program on that new computer. Test it and make sure its running.
Buy a 1gb memory stick and plug it in to the computer that is in use.
Set up your windows backup program to take a backup every x-hours (do it every hours in the opening hours) make it stores it on the Memory stick.
Set up the backup so it keeps the last 20 or so backups, and overwrite the others.
If the main system fails you can plug in the backup computer, restore the database from the memory stick and go back to work within minutes
There are better ways of doing it for sure, but this one is simple and can be done by one with almost NO computerskills, if you make them a sort "to do" list in case of breakdown
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