realizing all of my stuff at home is going offline because there's a power outage while i'm away is making me wonder something

what if i cobble together a router UPS (server is already battery-powered laptop)

would a regular phone power bank outputting to a 5-to-9v boost converter work or am i being silly

(i do not want a bulky 110v ac ups)

@squirrel I tried something like this and it mostly worked, but the charge circuitry didn't like having brown outs, so sometimes it'd behave oddly during storms.