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As a back up in cases like the first hard drive gets fried
A writer maybe, because you can work by yourself, even at home.
Answer:
The broad responsibility of a UX designer is to ensure that the product logically flows from one step to the next. One way that a UX designer might do this is by conducting in-person user tests to observe one’s behavior.
Explanation: I don't know if this is what your looking for though.