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Discover Ludwig"backup power" is a perfectly correct and usable phrase in written English.
You can use it when referring to an alternate or secondary power source in case the primary power source fails or becomes unavailable. For example: "We installed a backup power supply in case of a power outage."
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Others rushed to find fuel for backup power generation.
One category of backup power systems charges cellphones and smartphones.
The main battery provides backup power for the cockpit displays.
Cordless phones, for example, would not work without backup power.
Many hospitals and educational institutions have backup power stations.
They will serve as backup power for heaters.
The remedy, he said, is a backup power source.
Backup power and extensive fuel storage will be provided.
So operators of the electric grid must make sure there is plenty of backup power available.
The grid will serve mainly as a backup power source for the new center.
Boeing has said the plane's systems switched to backup power after the fire broke out.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com