As a bonus, if there's a complete blackout, the battery keeps your computer, monitor, and drives running long enough to paste whatever is on the clipboard, save all documents, quit, and shut down gracefully. Your can buy a UPS at all local office supply and computer stores, and through mail order catalogs. The numbers correspond to the capacity of the battery. Most current UPS and surge protector models include surge protection for one or two phone lines. Be aware that connecting more than one device through the use of a splitter may, in effect, invalidate the accompanying insurance policy.
Lightning can also hit exposed cable TV, satellite TV, and network cables.
Few UPS models protect these kinds of wiring but you can find surge protectors that will. They're worth it. Certainly, every computer user needs to protect their system with a surge protector. Every computer user also needs to protect the telephone lines coming into the system. Where lost changes or corrupted files equate to significant rework and missed deadlines, a UPS is a must.