version: '3.8'
services:
  db:
    image: postgres:latest
    restart: unless-stopped
    environment:
      POSTGRES_PASSWORD: example
      POSTGRES_USER: yourusername
      POSTGRES_DB: yourdatabase
    volumes:
      - ./data:/var/lib/postgresql/data
      - ./backups:/backups
    ports:
      - "5432:5432"
    command: >
      bash -c "while true; do
        pg_dumpall -U ${POSTGRES_USER} -f /backups/db_$(date +%Y%m%d%H%M%S).sql;
        gzip /backups/db_$(date +%Y%m%d%H%M%S).sql;
        sleep 24h;
      done"