Question: In data warehousing, at which point is it important that data copies are deleted after the data is transferred? Extracting the data from its source

In data warehousing, at which point is it important that data copies are deleted after the data is transferred?
Extracting the data from its source
Moving data from the source to the staging area
Moving the data from the warehouse to the data mart
Moving the data from the staging area to the warehouse

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