From the main ACPT menu select Export. The Export looks like that:
Select the desired post types to export by toggling the corresponding button under the column 'Post structure and associated taxonomies' and press the green button to export data.
The process will export also the associated taxonomies, the meta box fields, and eventually the product data (for WooCommerce product post type).
Please note that the exported data only refers to ACPT data, the posts will not be exported.
The resulting exported file in .acpt format is nothing but a compressed JSON file.
From the main ACPT menu select Import. The Import page looks like that:
Upload here a valid ACPT backup (in .acpt format).
If the file is valid an alert will inform you that the data was successfully imported.
Please note that the data only refers to ACPT data, the posts will not be imported.
If you need to import/export data you have to use a different plugin.