I picked up this APC 450 battery backup from Costco last night for $36…I don’t recall ever seeing them that cheap. The box suggests up to 28 mins of backup power…the webpage linked has it somewhat lower depending on load.
Recently we had a power outage. I have a NAS, wireless router and cable modem that could have benefited from this if for nothing else to allow me to shut them down properly from my laptop (which of course has it’s own battery backup so to speak) during the outage.
This is by no means a high end, enterprise product, but neither is my home setup. At this price point, it seemed like a good investment in protecting those devices.