Save a copy of a Jupyter notebook in a '.history' folder every time the notebook is saved

jupyter_notebook_config.py

import os
import shutil
import pathlib
from datetime import datetime

def post_save(model, os_path, contents_manager):
    """post-save hook for saving backups of jupyter files."""
    if model['type'] != 'notebook':
        return # only do this for notebooks
    directory, filename = os.path.split(os_path)
    history_directory = pathlib.Path(directory, '.history')
    if not history_directory.exists():
        history_directory.mkdir()
    now = datetime.now()
    shutil.copy2(os_path, history_directory.joinpath(now.strftime("%d_%m_%Y_%H_%M_%S") + filename))
c.FileContentsManager.post_save_hook = post_save

Execute jupyter notebook --generate-config and add this snippet at the bottom of the generated config. Restart Jupyter and it should work.