powerbackup
nounUK /ˈpaʊə bækʌp/
US /ˈpaʊər bækʌp/
A power backup is a battery or machine that keeps things working when the electricity goes off.
We used a power backup to keep the lights on during the storm.
OTHER MEANINGS
2. Extra electricity stored in a device so it can keep running if the main supply fails.
The phone's power backup lasted all day.
3. A person or team ready to take over if the main one cannot play or work.
He is the power backup for the lead singer.
4. A copy of computer data saved in case the original is lost.
Make a power backup of your files every week.