Here, you can select which media libraries will be included in the export package. The following extra options can be adjusted:
•Export media files - if checked, media files stored in the database will be exported.
•Export physical files - if checked, physical media files stored in the file system will be exported. This option is not selected by default as it may cause the package size grow extremely large. Instead, it is recommended to export these files manually.
Detailed information about the built-in export/import functionality in Kentico CMS can be found in Developer's Guide -> Managing sites -> Export and import.