Fallback

Fallback

 Definition(s):

A fallback facility is another site/building that can be used when the original site/building is unusable or unavailable.

 Source: BCI/DRJ

Merriam-Webster Online Dictionary
fallback (noun)
1.
something on which one can fall back - reserve often used attributively a fallback career a fallback position
2.
a back - falling retreat
3.
something that back - falls the fallback from an explosion
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Fallback is a term used to describe a system or plan that is used when the primary system or plan fails. It is often used to refer to a backup plan or a contingency plan.