When I choose to import/export a data script with PhpMyAdmin, it offers me to upload/download a file with my browser from/to my PC where I access it from. But I'd like to load/save the file from/to the file system of the server where the MySQL server and PhpMyAdmin run. Is this possible?
Yes, you can set a directory to import files from in the phpMyAdmin config file...
From the docs http://www.phpmyadmin.net/documentation/#cfg_UploadDir
$cfg['UploadDir'] string The name of the directory where SQL files have been uploaded by other means than phpMyAdmin (for example, ftp). Those files are available under a drop-down box when you click the database or table name, then the Import tab.