Exports is always an difficult request to solve.
Maybe it's a better Idea to make a report builder.
Where you can create your own reports with only the information, filters and sorting that you want.

If you can export a report to CSV, EXCEL, PDF etc maybe we have the perfect solution

Maybe it's a good idea to implement the export functions in small steps.
Do not wait until you can export everything. Then everyone will wait a long time and wait.

But start with the tasks for example.

My personal favorite. due to the delivery of the project status to the clients

Or even better ...
When you change a process or functionality in Ryver, ask the development team to make the export functionality associated with that part of Ryver at the same moment..

The way Wunderlist solved this is awesome .
When you complete the task it creates the same task again in the same group with the new due date or completed date.
Of course with the chosen interval. day, week month year

For a Task manager it is a must have.
This will allow me to move almost everything from Wunderlist to Ryver.