text: what is the best ups to get to protect a cable modem and router? i intend to plug only the cable modem and router into a ups (not the computer itself, which is on a separate surge protector).  what size ups do i need?  also, is this a better option than an apc surgearrest 11 outlet? any inexpensive ups of 300 - 500 kva will do fine.  those don't draw much power and will run for quite some time on a small ups.