Unplugging when you leave the house for an extended period or when you know that thunderstorms are likely is the best and wisest protection.
But there are other types of surges in the mains that are random and unpredictable, such as when a transformer blows or when a generator is taken off line or when power is simply interrupted and then comes back on. These surges, especially an accumulation of them over time, will damage your system. Extremely fast, high quality surge protectors are a defense against damage caused by these surges.
But there are other types of surges in the mains that are random and unpredictable, such as when a transformer blows or when a generator is taken off line or when power is simply interrupted and then comes back on. These surges, especially an accumulation of them over time, will damage your system. Extremely fast, high quality surge protectors are a defense against damage caused by these surges.