Copy images from the Spotlight (lockscreen images) folder to Downloads\WinSpotlight
Works with Python3.6+, though the most recent version is recomended since supported.
https://www.python.org/downloads/release/python-370/
Simply double click the script to use it.
You'll need Python Imaging Library (best to use pillow)
pip install pillow
Use only if you just want to periodically back up images that you are actually recieving, if you want to download MORE I suggest using ORelio/Spotlight-Downloader