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I'd say you should always have a good supply of cash on hand.
IF one or many or our "systems" fall apart it'll be the only thing that'll help you. If I travel I always have about 2k in cash. One time several years ago, I think it was during trumps FIRST term, we had one of those instances where the credit card systems failed where we were staying in the midwest. No cards would work anywhere. For 2 days our cash took care of us.