redundancy is a system in which a component is duplicated so if it fails there will be a backup. redundancy has a negative

backup duplication replication faulttolerance redundant spare repetition overabundance excess superfluous duplicated surplus rerun overflow surfeit overkill reduplication surrogate excessive unnecessary extra surplusage overstock duplicitous overplus overmuch overload unneeded redundancy check plan faulttolerant duplicate data system storage array elimination procedure file replicated information copy testing capacity component faultredundant