JUST the cable modem and router, not the whole PC. This is for the internet/ phone service.
There's no way of saying without further information. You need to know the amount of power provided by the UPS battery as well as the power drain by the cable modem and router to calculate this accurately. Generally speaking, a standard household model of cable modem and router do not pull a lot of power. Just ballparking it, since the power drain from both is fairly low...A UPS 750 will probably support the two devices together for about 45 minutes to nearly an hour...assuming NOTHING else is plugged into the UPS and using power from it. Be aware, however, that your local ISP will also be on backup or generator power...during an extended outage from a hurricane or serious snowstorm...sooner or later, they will go down too. .
