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A redundant system or service that is kept available for use in case of a failure of a primary facility.
NIST SP 800-152
Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.
Comments about the glossary's presentation and functionality should be sent to firstname.lastname@example.org.
See NISTIR 7298 Rev. 3 for additional details.