All of the registration data is stored within your site’s own database, so you’ve always had access to that data (We, EventEspresso.com do not store or even have any access to your event/registration data on out servers).
If you go to Event Espresso -> Event Overview, you’ll see a list of your events.
However over the event and click the attendee link that appears below it.
Now you’ll see a list of Attendees for the event.
Click the export to excel button down the bottom to export.