Backing Up All Photos from Flickr to Google Photos
Request an archive of your photos and metadata (json) from the "Your Flickr Data" section of your Flickr user account page.
Extract all provided zip files to a single folder with the JSON files unzip to a
Install exiftool, a command-line application for reading, writing and editing meta information in a wide variety of files..
Sort your Flickr photos into yearly folders by EXIF timestamp and set file-system timestamps from the command line: