Most of us have UPS, but around here, I've seen outages that last 10 hours or longer. Does one lose the maps during a complete shut down of the receiver, as in as if it were unplugged? If so, then I guess my 922 would be screwed sooner or later, since one of these lengthy power outages is bound to happen sooner or later.
I would think most of the original c-band users (ones that paid over $1000 for a full setup and install) would have the means to have a whole house generator system which is $1000-$4000 depending on how many KW's you want. UPS is to tie one over long enough for the generator to get started.
Even a simple $200 generator would power ones computers/tv/receivers during a extended outage. Just be sure the UPS lasts long enough to get it hooked up and started.