I knew a guy in Colorado that had a ram pump that had been pumping for over 80 years to a cabin 200' above. As he became more interested in prepping he grew concerned with that old ram pump possibly breaking down from age. But since it hadn't been opened in nearly a century for repairs he decided to add a 2nd pump close to the first and let both run.
Ram pumps don't move much water but they never stop pumping.