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The short answer Line-interactive: handles everyday sags and surges efficiently and costs less. Best for network closets, workstations and small servers. Online (double-conversion): rebuilds the power from scratch, so connected equipment never sees a transfer. The standard for servers, medical and industrial loads. Choosing between an online (double-conversion) and a line-interactive UPS comes down to how clean your power needs to be, how sensitive your equipment is, and your budget. How a l …