Naw, just an extension cord running from a nearby light fixture to the nearest UPS! I.e., 4 or 5 feet would suffice to connect a nearby floor lamp to the UPS for this computer!
It depends largely on what we are "trying to get done" when the outage strikes. E.g., if SWMBO has settled down to watch a movie, it's annoying not to be able to *finish* that movie. In that case, I'll drag out one of the larger laptops and let her watch it "in her lap" -- not quite the same experience as on the big screen but better than having to come back to the MIDDLE of the story some time later (when she may want/need to be doing something else). Likewise, if you'd made time to read a book, you want to continue reading -- not have to return to it at a later time that's more convenient for the electric company!
If I'm "writing code", I can quickly copy the file(s) onto a thumb drive and move over to a laptop to continue (none of my systems can stay up for that long even on the larger UPS's -- can you spell "powerhog"?)
If it's daylight, then, chances are, we're outside or away from home and don't really care about the outage.
As for "time together", that's already built into our schedules. So, we each know what time we can expect to address our individual wants/needs while still ensuring that we don't become "just roommates".
The "backup" is important as you may want to USE that phone during the outage. E.g., to call to REPORT the outage! :>
We *welcome* not hearing from people. But, aren't eager to be cut off from our ability to phone others! "Why don't we do our grocery shopping NOW and get it out of the way. Do you think stores X, Y and Z are suffering outages? Would it be a waste of time to drive over? Perhaps call first??"