Can community data, including posts, users, uploads and passwords be exported?
Click on admin by opening the hamburger menu at the top right.
Choose what you want to export between the various items listed
Click on it
Pick an initial date and a final date
Wait the pop up and click OK
Wait the PM from @system and download the report
Because of this bug CSV export of reports fails you have to update discourse to the latest version (if the fix has already been merged)
You might get a better answer if you say what you want to do with the data.