ff928931__Data_Is_to_Produce_Small_Data__Big_Data
[0] Longevity [Small Data] When the data project ends, the data is kept for a limited time (seldom longer than 7 years, the traditional academic life span for research data) and then discarded. [Big Data] 
Big data projects typically contain data that must be stored in perpetuity. Ideally, data stored in a big data resource will be absorbed into another resource when the original resource terminates. Many big data projects extend into the future and the past (e.g., legacy data), accruing data prospectively and retrospectively.
The Most Common Purpose of Big Data Is to Produce Small Data
Big Data