Resilience means keeping services running, or restoring them quickly, when components fail or disasters strike. It combines two ideas. The first is design that avoids single points of failure, so that one broken disk, power supply or server does not stop the service. The second is backup, so that when data is lost, corrupted or encrypted by ransomware, it can be recovered to an acceptable point. Redundancy handles hardware failure well, but it faithfully copies mistakes and malicious changes too, which is why backups are still needed even in highly redundant systems.
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