An Uninterruptible Power Supply (UPS) provides protection against blackouts and brownouts. In this age of tablets and laptops the modern office seldom comes equipped with a battery backup device. Most of us are lucky to get a power strip with a surge protector.
The need for a UPS still exists. Small power supplies to protect modems, routers, NAS devices and DVRs are now available. These devices have a low current draw so they don’t need those large bricks like a CPU require.