Redundant

In information theory the redundancy is the number of bits used to transmit a message minus the number of bits of actual information in the message. In many situations an increase in redundancy makes the system more robust since it allows for error detection and correction.

In engineering, redundancy is the duplication of critical components of a system with the intention of increasing reliability of the system, usually in the case of a backup or fail-safe.

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The following pages link to here: Backup