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Fault tolerance computing also deals with outages and disasters. For this reason,
a fault tolerance strategy may include some uninterruptible power supply (UPS)

such as a generator—some way to run independently from the grid should it fail.

Byzantine fault tolerance (BFT) is another issue for modern fault tolerant
architecture. BFT systems are important to the aviation, blockchain, nuclear
power, and space industries because these systems prevent downtime even if
certain nodes in a system fail or are driven by malicious actors.

Relationship Between Security and Fault Tolerance?

Fault tolerant design prevents security breaches by keeping your systems online
and by ensuring they are well-designed. A naively-designed system can be taken
offline easily by an attack, causing your organization to lose data, business, and
trust. Each firewall, for example, that is not fault tolerant is a security risk for
your site and organization.