2014 article
Will You Ever Need an Exit Strategy?
IT PROFESSIONAL, Vol. 16, pp. 4–6.
TL;DR:
It's critical to plan for unanticipated events, such as providing safe and affordable ways of retrieving and transferring your data from a cloud if the need arises.
(via Semantic Scholar)

UN Sustainable Development Goal Categories
9. Industry, Innovation and Infrastructure
(Web of Science)
Source: Web Of Science
Added: August 6, 2018
Many decision makers fail to consider an exit strategy when adopting a new solution, because few want to consider the demise of the wonderful solution being implemented with great effort and expectation. Yet it's critical to plan for unanticipated events, such as providing safe and affordable ways of retrieving and transferring your data from a cloud if the need arises.