Backup power systems are designed to provide electricity when the main power source fails. These systems can include generators, uninterruptible power supplies (UPS), and battery storage. They are commonly used in homes, businesses, and critical facilities to ensure that essential services remain operational during power outages. These systems can automatically kick in when a power failure is detected, minimizing disruption. For example, a generator can start running within seconds, while a UPS provides immediate power to sensitive electronics, like computers, allowing for safe shutdowns. Overall, backup power systems enhance reliability and safety during unexpected outages.