Where are collections staged prior to being moved to the Job Data folder?
Site Server (Computer & Network Share jobs):
Collected data is staged in the "storage" folder in the Site Server Results folder.
The Site Server Results path can be found in the Site Server Configuration (Start > AccessData > Site Server Configuration).
Work Manager (All other jobs):
Collected data is staged in the "Local Responsive Data Folder" as defined in the Work Manager Configuration on the machine running the Work Manager responsible for Collections. It can viewed/changed by going to Settings >> Work Manager Console >> [select Work Manager] >> Configuration.
This explains where data is staged (temporarily stored) during a collection, prior to being copied to the Job Data folder.