second copy

• duplicateExact replica of original
• carbon copyIdentical reproduction of something
• replicaFaithful scaled reproduction
• backupStored duplicate for recovery
• spareHeld in reserve

clone · reproduction · xerox · photocopy · facsimile · ditto · mirror · reprint · transcript · echo · shadow · twin · double · runner-up · silver medal · understudy · backup plan · redundancy

• Redundancybackup, duplicate, spare, copy, clone
• doublesdouble, doubles, twin, twins, duplicate