Question

What is the meaning of backup and why the data backup is essential?

Answer 1

backup means saving important data to ram . even if external power supply is cut of our data doesn't get lost and if we need that our data in any condition should not get damaged or erased  we should keep a backup of it .
plz mark it as the brainliest

Answer 2

backup means keeping the copy of the data for future if it is lost unexpectedly.