This is a REDCap external module that provides functionality to export large projects.
<redcap-root>/modules/export_large_projects_v0.0.0
.Access External Modules from the Control Panel to set the number of fields exported in each batch and the maximum execution time for the entire export.
Once this module is enabled for a project, go to "Data Exports, Reports, and Stats" section. In here, the Export Large Projects button is presented as shown in the below image. Click that button to start the export. A progress indicator will show the stepwise export of the data. After all the chunks have been exported and assembled into a single CSV, a download link is presented to download the entire file.