WordPress snippet - its a simple plugin which instead of sending e-mail, saves given post data as a post content. In this stage it is not dynamic and require some preparations in order to make it work.:)

post-cf7-form.php

<?php
/**
 * Plugin Name:  Post Form
 * Description:  Umożliwia dodanie wysłanego formularza jako postu w kokpicie do przeglądu.
 * Version:      1.0
 * Author:       ziemekpr0
 * Author Email: ziemekpr0@gmail.com
 * Author URI:   http://wpadmin.pl
 * License:      GPLv2 or later
 */

/* Security check - block direct access */
if (!defined('ABSPATH')) exit('No direct script access allowed');

/* Musli Social Links */
class Post_Form
{

	public function __construct()
	{
		// Do not send me those data again in e-mail
		add_filter('wpcf7_skip_mail', array($this, 'skip_mail'), 10, 2);

		// Send me notification

		// Get CF7 submissions
		add_action('wpcf7_before_send_mail', array($this, 'save_submission_as_post'));
	}

	public function skip_mail($skip_mail, $contact_form)
	{
		if($contact_form->id == 235)
			return true;
		else
			return $skip_mail;
	}

	// -------------------------------------------------------------------

	public function save_submission_as_post()
	{
		$cf7_instance = WPCF7_Submission::get_instance();
		$submission = $cf7_instance->get_posted_data();

		/*
		print_r($submission);
		
		>> OUTPUT:

		Array
		(
			[_wpcf7] => 1960
			[_wpcf7_version] => 4.4.2
			[_wpcf7_locale] => pl_PL
			[_wpcf7_unit_tag] => wpcf7-f1960-p1961-o1
			[your-name] => Andrzej
			[your-email] => dasdsa@aa.pl
			[your-subject] => Jakiś temat
			[your-message] => Treść wpisu
			[_wpcf7_is_ajax_call] => 1
		)*/

		
		/**
		 * Optional: Create new users account
		 */

		// Let's check if the given e-mail exists
		// if so in $is_email_exists we will get that users ID, else
		// we have to do some other stuff

		$email = $submission['your-email'];
		$is_email_exists = email_exists($email);

		if($is_email_exists === FALSE)
		{
			// create a unique username
			if(username_exists($submission['your-name']))
			{
				$x = 2;
				while( username_exists($submission['your-name'] . $x) )
				{
					$x++;
				}

				$user_name = $submission['your-name'] . $x;
			}
			else
			{
				$user_name = $submission['your-name'];
			}

			// lastly create a new password for that user
			$random_password = wp_generate_password();
			
			// finally create new user
			$user_id = wp_create_user( 
				$user_name, 
				$random_password, 
				$submission['your-email']
			);
		}
		else
		{
			$user_id  = $is_email_exists;
		}


		/**
		 * Create and save post data
		 */

		$post_data = array(
			'post_type'		=> 'post',
			'post_status'	=> 'draft',
			'post_title'	=> $submission['your-subject'],
			'post_content'	=> $submission['your-message'],
			'post_category' => array(13),
			'post_author'	=> $user_id //remove if you do not want to create user accounts
		);

		wp_insert_post($post_data);

	}

// [contact-form-7 id="1960" title="Dodaj wpis"]
// $skip_mail = apply_filters( 'wpcf7_skip_mail', $skip_mail, $contact_form );


}

new Post_Form;

Thanks. I just needed a chunk from the above code.