CompTIA Security+ Exam Prep

Answer: B - The distance between the originating site and the redundant site should be at least 50 miles. When choosing a backup facility, it should be far enough away from the original site so one disaster does not take out both locations. There is a rule of thumb that suggests that alternate facilities should be at a bare minimum at least five mile miles from the primary site, while 15 miles is recommended for most low-to-medium critical environments and 50-200 miles is recommended for critical operations to give maximum protection in cases of regional disasters.