def METHOD_NAME(dbm, lostconfig, admin_default_group):
    lost_fs = dbm.get_fs('default')
    if lost_fs is None:
        print('Create first FileSystem entry for default in database')
        lost_fs = model.FileSystem(
            connection=json.dumps(lostconfig.data_fs_args),
            name='default',
            root_path=lostconfig.data_path,
            timestamp=datetime.utcnow(),
            fs_type=lostconfig.data_fs_type,
            group_id=admin_default_group
        )
    else:
        print('Update FileSystem entry for default fs in database')
        lost_fs.connection = json.dumps(lostconfig.data_fs_args)
        lost_fs.root_path = lostconfig.data_path
        lost_fs.fs_type = lostconfig.data_fs_type 
    dbm.save_obj(lost_fs)