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)

something on which one can fall back - reserve often used attributively a fallback career a fallback position

a back - falling retreat

something that back - falls the fallback from an explosion

Merriam-Webster Online Thesaurus

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.

Synonyms:

Alternate Locations, Alternate Site

Glossary: Secondary Site