In order to export (unload) data and/or the database catalog, you can use either Database Studio or Loader.
Caution
You cannot use export data to restore a database because in some situations the exported data may not represent a consistent database state. Export data is, therefore, not a substitute for data backups.
Database Studio, Exporting Data or the Database Catalog
Loader, Exporting: Loader Commands
Database Administration, Export and Import