"Critical data" refers to important information that is absolutely necessary and can have significant consequences if it is lost, compromised, or inaccessible. Full definition
Most professionals can think of a time they were traveling, or out of office, in need of critical data that wasn't accessible from wherever they were. (inc.com)
This information can be used for figuring out the highest and best use, which serves as critical data in the home mortgage appraisal process. (springshomes.com)
Performance measures can provide program staff with critical data about how services are delivered. (tribaleval.org)