Originally Posted by
wolfy
Is it a finished, environmentally controlled basement? (Not necessarily sounding like it)
If not, I'd suggest reconsidering if there might be something above grade that could be moved to the basement to make room for the safe upstairs.
Is there a closet full of crap that you'd miss less than your gun collection?
Maybe you've already exhausted other options.
My sump pump runs 365 days a year, cycling as much as every minute at times during the rainy season so I understand your concerns.
I've had pumps fail, check valves fail, power outages, frozen pipes, but so far (knock on wood) never a flood.