I do not believe to clouds and prefer have local copy of all my data. But Notion is very useful tool with no open source alternatives. This script can backup all data using standard export feature in Notion.

This thing require NodeJS to run.

npm i
mkdir -p data
EMAIL=mail@exmaple.com PASSWORD=kek EXPORT_TYPE=both node notion

You can also use Docker image with this scrip and cron

docker run -e EMAIL=mail@exmaple.com -e PASSWORD=kek ivanik/notion-backup

Docker compose file example

version: "3"
services:
 notion-backup:
 image: ivanik/notion-backup
 environment:
 EMAIL: notion-email@exmaple.com
 PASSWORD: n0t1onPa$$w0rd
 EXPORT_TYPE: both # markdown/html/both
 DELETE_OLD: 15 # delete backup after 15 days
 volumes:
 - ./data:/app/data # backup dir
 - ./crontab:/app/crontab # change cron settings (optional)

• Email - Notion email
• password - Notion password
• EXPORT_TYPE - export format markdown/html/pdf/both (pdf is only available with a personal plus plan or higher. both - backup in markdown and html)
• DELETE_OLD - after how many days delete backups