Definition of the word backup

The term "backup" originated in the realm of music and theater, where it referred to a **substitute performer** who would step in if the main performer became unavailable. This concept extended to **duplicate copies** of important materials, like musical scores or scripts, ensuring a show could go on even if the originals were lost or damaged. This usage transitioned into the computer world in the 1960s, where "backup" became synonymous with **creating copies of data** to protect against loss or corruption. The analogy of having a substitute performer for a crucial role perfectly captured the essence of having a secondary version of vital information.