The correct answer is C. Provides backup power.
A UPS (Uninterruptible Power Supply) is a device that provides temporary battery power to an electrical load when the input power source, such as an electrical grid, fails. A UPS can be used to protect computers, servers, and other sensitive equipment from power outages and brownouts.
Option A is incorrect because a UPS is not used for storage. Option B is incorrect because a UPS does not increase the speed of a computer. Option D is incorrect because a UPS does not do all of the above. Option E is incorrect because a UPS does provide backup power.