Living off grid and your well pump decides to die, Importance of redundancy

When a well pump decides its time to quit that usually means calling in the professionals to come and fix things.
But one thing living off grid has taught me is the importance of redundancy. Having all of the right tools, hardware, and skills on hand when things like this happens is really important. There are no stores close by and after all what if at some point things get to the point where those who have practiced self reliance are the only ones able to see themselves through?