Experts say how individual companies choose to save their data in anticipation of an outage depends on how long they can survive before the lights are turned back on. Dark disaster recovery vs. active architecture is the unicorn of the DR world, experts say. Active/active architecture allows for there to be no downtime in the event of a disaster where one server is knocked offline. Asynchronous vs. synchronous replication involves losing some data between the downtime and when the server was last updated.”]