Of course, surge protection only works for about a year and this UPS is older than that. The power was out for about 2.5 hours. From then on you run unprotected. Backing up the protection in my UPS is a Brick Wall Series Mode Surge Filter. There are no MOVs in a Brick Wall, just a humungous series inductor coil.
Nothing gets through it.
I have one Brick Wall for my computer and another for my Home Theater setup. On my advice my audio adviser is recommending them for his customers even though Brick Wall only sells direct from the manufacturer and he can t make a penny on such sales. But his customers appreciate the protection, available in no other way save disconnecting the power cord when the equipment isn t in use. I found out about Brick Wall from their ad in Stereophile in 1997. Such a unit can save you thousands of dollars worth of equipment.