Yes you can export a catalog (database) for example to move it to another computer or to combine it with another catalog. But the database still needs to connect with the original images in your folders so you don’t really want to dump them.
If you mean you wish to export duplicate copies, simply go to the Catalog tab (top-left) and select All Photographs, press Ctrl+A (Cmd+A) to select all thumbnails and then click the Export button.
Thanks for replying 99jon. That would export them all but not the directory structure. Looks like it has to be a folder at a time.
You can select a batch of folders. Highlight the first and shift+click the last in a list.
Thank you again, that helps but the folder structure is lost. I have
78,000 images in 1200 folders and want to create an archive of them all in
the LR edited form. Exporting 1200 folders one at a time is a lot of
work. I was hoping someone might have an easy solution