Installing a battery backup for your garage door opener is important for various reasons, including: 1. In the event of a power outage, the battery backup ensures that your garage door can still be operated. 2. A battery backup provides an added level of convenience and accessibility, especially for elderly or disabled individuals. 3. In emergency situations, where a functioning garage door is necessary for safety, the battery backup can save lives. 4. Having a battery backup reduces the risk of being manually locked out of your garage due to power failure.