You can backup all the photos and the metadata in your LAMU to a storage location you choose. Click on the "Backup" button will display the Backup window. All media files and metadata in LAMU will be backed up using LAMU native folder structure and file names.
Note, if you only wish to backup a selected subset of photos, you can find these photos and create an album. Then you can export all photos in the album by right click on the album in Album View.