What is the term for a duplicate copy of a program or data kept for reference in case the original is damaged, lost, or destroyed?

Question

Quizplus · Accepted Answer

A duplicate copy of a program or data kept for reference in case the original is damaged, lost, or destroyed is called a backup. The other choices, operating system and optical disc, do not specifically refer to a duplicate copy of a program or data. DVD is a physical medium that can store data, but it is not necessarily a backup copy.

What Is the Term for a Duplicate Copy of a Program