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Choosing an APC UPS comes down to three things: the watt rating of everything you plug in, the runtime you need, and the output waveform. Add up the power draw of your PC, monitor, router and NAS, then choose a UPS whose watt capacity clears that total with headroom to spare.
Waveform matters for modern gear. Entry Back-UPS models output a stepped, simulated sine wave that is fine for basic PCs and networking, while active-PFC PC power supplies and servers run best on the pure sine wave output of Back-UPS Pro and Smart-UPS units. A UPS handles instant cutover and surge protection; for long load-shedding slots you add an inverter or battery bank.