the.com/failover
the backup dancer that becomes the star the second the lead trips.
means an automatic switch to a redundant system when the primary one fails, so the show goes on without you noticing.
from from telecom and mainframe engineering in the 1970s-80s, where 'fail' plus 'over' described handing control over the instant something broke, not waiting for a human to notice.
invisible ideala perfect failover means users never know it happened
opposite failurefailback is switching back once primary recovers
tested rarelymany failovers untested until the day they matter