This is really scary if half way through the party something happens to the sound equipment, what will you do? Well if the DJ doesn’t carry a back-up system the party is over. If the DJ has a back-up system the party is only interrupted for a few minutes while he changes a component or replaces the system. Even professional equipment can fail on occasion, so it is very important to know whether your DJ has a spare system available to them. Any number of circumstances may arise between the times you booked your DJ till the time of the event. Make sure the DJ has a back-up plan in case of illness or accident.