A replica or copy of something is a duplication, and the process of making it is also duplication. Duplication of important computer files is always a good idea — that way you have a backup if you accidentally delete something or your laptop malfunctions.

The earliest meaning of duplication was "act of doubling," from the Latin duplicare, "to double." By the 1580s, it gained the sense of "an act of making or repeating something essentially the same." Duplication can be as simple as making paper copies (or duplicates) with a Xerox machine, or as complicated as certain genetic processes in which parts of DNA are repeated.

Definitions of duplication

n the act of copying or making a duplicate (or duplicates) of something

“this kind of duplication is wasteful”
Type of:
an act of copying

n a copy that corresponds to an original exactly

backup, computer backup
(computer science) a copy of a file or directory on a separate storage device
counterpart, similitude, twin
a duplicate copy
match, mate
an exact duplicate
Type of:
a thing made to be similar or identical to another thing

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