UPS's vary in size and length of time they provide power. The one I am using is about the size of a shoebox, but the battery inside it is only about the size of a pound of butter. Physical size doesn't matter as much as length of time. You should never plan on using a UPS for an extended period of time. All electricity is not the same. Only use a UPS to provide temporary power long enough to get your work saved and your computer properly powered down.
APC is one of the most popular providers of UPS power. Here's a look at one of their personal UPS backup solutions: APC Back-UPS ES 8 Outlet 550VA 120V. Here's a UPS from one of their competitors:
One rule of thumb when using UPS protection: only essential appliances get plugged into UPS outlets. Printers are not essential for shutting down a computer so they do not get plugged into UPS power supplies. Even though a monitor is a big power hog, it needs to be plugged into the UPS because you can't see the screen to shut down the computer.
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