The purpose of a redundancy plan in IT infrastructure is to ensure continuity and minimize downtime during unexpected failures. This plan involves creating backup systems, such as duplicate servers, storage, and network paths, to take over in case of a primary system failure. Redundancy enhances system reliability and guarantees that critical applications remain operational, thus protecting against data loss and ensuring that service levels are maintained. Additionally, it aids in disaster recovery strategies, allowing organizations to recover quickly without significant disruption. Ultimately, a well-implemented redundancy plan is vital for business resilience.