Local backup function for dlna

src/freedombone-app-dlna

 VARIANTS='full media'
 
 function upgrade_dlna {
-    echo ''
+	echo ''
 }
 
 function configure_firewall_for_dlna {
 }
 
 function backup_local_dlna {
-	echo ''
+	source_directory=/var/cache/minidlna
+	if [ -d $source_directory ]; then
+		dest_directory=dlna
+		echo $"Backing up $source_directory to $dest_directory"
+
+		function_check backup_directory_to_usb
+		backup_directory_to_usb $source_directory $dest_directory
+
+		echo $"Backup to $dest_directory complete"
+	fi
 }
 
 function backup_remote_dlna {