The Batch tool shows a history of all recent files that have been processed. When there is a need for further copies of these images, you can simply reprocess them.
NOTE: With the release of Capture One 21 (14.3.0) the Batch Queue and Process History have been removed from the export settings.
With the release of Capture One 21 (14.4.0) the Batch Queue tool is re-introduced as an Export Queue.