Over 20 million units sold, the UPS you can trust The award-winning APC Smart-UPS is the world's most popular UPS for server, storage and network power protection. Trust it to protect critical data and equipment from power problems by delivering clean, reliable network-grade power. In addition to legendary reliability and manageability, Smart-UPS have extremely high efficiency at low, medium and high load levels, making them ideal for today's multi-core or virtualized server.