There is no general requirement. But, the article refers to a “litigation hold”. That’s something that will arise out of a specific lawsuit, and will be an ord

There is no general requirement. But, the article refers to a “litigation hold”. That’s something that will arise out of a specific lawsuit, and will be an order from a judge that says the company is required to preserve documents and other evidence that pertain to the litigation. So, not a general law that’s required all the time, but an order from a Judge in specific cases, that apply for the duration of the case.