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An uninterruptible power supply device, UPS, will take over when a power outage occurs. This gives the user time to save and close any open programs, folders and files, and to shut down the computer properly until the main power comes back on. The battery in a laptop, when the laptop is also connected to the mains, will act as a UPS if an outage occurs.

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Q: What is a device that during a power outage?
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