oduce a replica of some stored information in a different part of the store or on a different storage device. For example, a piece of text or graphical information can be copied by marking it in some way, reading it into a temporary storage area, and writing it into a new location (compare cut). [Computer and Information Sciences] 
 n., Something that is identical to something else; a facsimile. [General Dictionaries] 
 
n., A change in data such that the data content received is not what was originally sen