On project level it should be possible to export all tasks of a project in one zip file.

Yet, only tasks where all workflow steps are finished should be included in the zip file.

If there are tasks in the project, where not all tasks of the project are finished, a dialogue should pop up that lists the tasks that are not finished and ask the user, if he wants to export all finished tasks or if he wants to abort.

Regarding implementation, I assume, the best and easiest would be:

• The project export
  • queues export workers for all tasks
  • checks, when all workers are done
  • zips the exported data in one zip and offers it for download
• the export workers write their task export data to a temporary directory, where the project export can zip it, when all workers are finished