https://www.gog.com/forum/general/gogrepopy_python_script_for_regularly_backing_up_your_purchased_gog_collection_for_full_offline_e/post2896
gogrepo.py - Python script for regularly backing up your purchased GOG collection for full offline...
https://www.gog.com/forum/general/gogrepopy_python_script_for_regularly_backing_up_your_purchased_gog_collection_for_full_offline_e/post3498
gogrepo.py - Python script for regularly backing up your purchased GOG collection for full offline...