Answer: mirroring

AnswerCrossword Clue
MIRRORINGReflecting
mirroringthe act of reflecting with a mirror
mirroring(of a reflective surface) Show a reflection of
mirroringStore copies of data on (two or more hard disks) as a method of protecting it
mirroringKeep a copy of some or all of the contents of (a network site) at another site, typically in order to improve accessibility
mirroringCorrespond to