Murali is preparing to acquire data from various devices and systems that are targets in a forensic investigation. Which of the following devices is the least volatile according to the order of volatility?

Backups are considered to be the least volatile type of storage since they change at a much slower pace and, in fact, may be intentionally retained for long periods of time without changing. In this list, CPU cache will change the most frequently, then RAM, then local disk contents.