Which is a necessary step in maintaining computer hardware?

Using a UPS (Uninterruptible Power Supply) or a surge protector is crucial for maintaining computer hardware because it safeguards the equipment from power surges and unexpected power outages. Power surges can cause significant damage to hardware components, including power supplies, motherboards, and other critical internal elements. A UPS provides backup power in case of an outage, allowing the system to shut down safely, preventing data loss and hardware damage.

While the other choices might have their own importance—such as deleting old files for storage management, using wireless devices for convenience, or upgrading software for improved security—these actions do not directly contribute to the physical protection and maintenance of the hardware itself. Ensuring hardware longevity and functionality heavily relies on proper power management and protection equipment.