var filename = 'FILENAME.wpress';
var importer = new Ai1wm.Import();
var storage = Ai1wm.Util.random(12);
var options = Ai1wm.Util.form('#ai1wm-backups-form').concat({name: 'storage', value: storage}).concat({name: 'archive', value: filename});
importer.setParams(options);
importer.start();