S: (n) duplicate, duplication (a copy that corresponds to an original exactly) "he made a duplicate for the files"
S: (n) backup, computer backup ((computer science) a copy of a file or directory on a separate storage device) "he made a backup in case the original was accidentally damaged or erased"
S: (v) twin, duplicate, parallel (duplicate or match) "The polished surface twinned his face and chest in reverse"
S: (v) match, mate, couple, pair, twin (bring two objects, ideas, or people together) "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man?"; "The student was paired with a partner for collaboration on the project"