Same problem – clear missing basic function!
Makes it hard for easy use ...
Currently there is no option available for excel export in Epic stories
I created an idea on the ideaboard for. https://forum.mendix.com/link/space/epics/ideas/3896
There is a feature to export Archived stories. This is a workaround, see if it helps:
Exporting Archived Stories
On the upper-right corner of the Archive page, you can find the Export to Excel button. This allows you to export all the archived stories to an Excel file.
We are also interested in exporting / backing up the backlog somehow. Please let us know when the feature is available. We have over 50 stories in the backlog and it would be great to have a backup just in case.