Fallback 1 : Another (but less popular) term for alternative or alternate. A fallback facility is another site/building that can be use when the original site/building is unusable or unavailable
Business Continuity Institute, Lyndon Bird (FBCI), Dictionary of Business Continuity Management Terms (Version 2), Caversham, UK 2011. http://www.thebci.org/glossary.pdf, (BzCntMgt - Brit) {18}