Which of the following is a best practice for ensuring system redundancy?

Ensuring system redundancy is essential for maintaining operational continuity and minimizing downtime in case of failures. Utilizing failover systems and data replication represents a robust strategy for achieving this redundancy. Failover systems are designed to automatically switch to a backup system in the event of a failure in the main system, ensuring that services remain available. Data replication involves creating and maintaining copies of data in real-time or near real-time across multiple locations or systems. This ensures that, even if one system or storage location fails, data integrity and availability are preserved through the replicated copies.

This approach is widely recognized in industries where operational reliability is critical, as it not only enhances the resilience of the infrastructure but also helps in disaster recovery scenarios. By contrast, implementing legacy systems can introduce vulnerabilities due to lack of support and updates, continuously updating software without testing can lead to instability, and limiting access to crucial data does not actively contribute to redundancy but rather focuses on security and access control.