redundancy (suomeksi)

tarpeettomuus (s: state of being redundant)
redundanssi (s: state of being redundant / duplication of components or circuits to provide survival of the total system in case of failure of single components / duplication of parts of a message to guard against transmission errors)
ylimäärä (s: state of being redundant)
päällekkyys (s: duplication of components or circuits to provide survival of the total system in case of failure of single components)