# docker-compose.yml file
version: '3.8'
services:
  db:
    image: mariadb:latest
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: example
      MYSQL_USER: ${MYSQL_USER}
      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
    volumes:
      - ./data:/var/lib/mysql
      - ./backups:/backups
    ports:
      - "3306:3306"
    command: >
      bash -c "while true; do
        mysqldump -u root -p${MYSQL_ROOT_PASSWORD} --all-databases | gzip > /backups/db_$(date +%Y%m%d%H%M%S).sql.gz;
        sleep 24h;
      done"