Great job!
I am testing it for a new project instead the heavy and complicated wordpress and at the moment I am in love of your project. Thank you !

My suggestions:

User limited. (with permisions for create or edit some content only)
Save post new content when user session was off.
Sugestions with autocomplete for "vars" in edition
Add a password for each private page.
User registration with access only to a certain "tags" content

As a personal contribution:

I added my own sidebar option to save and download a .zip file of "pages" folder like this capture.
I will add a images backup soon.

Code i added in \automad\gui\inc\elements|sidebar.php

<li> <a href="backup.php" target="_blank"> <i class="uk-icon-file-zip-o uk-icon-justify"></i>  BackUp Site </a> </li>

My backup.php code:

`<?php
class toZipArchive extends ZipArchive
{
public function __construct($a=false, $b=false) { $this->create_func($a, $b); }

public function create_func($input_folder=false, $output_zip_file=false)
{
	if($input_folder !== false && $output_zip_file !== false)
	{
		$res = $this->open($output_zip_file, ZipArchive::CREATE);
		if($res === TRUE) 	{ $this->addDir($input_folder, basename($input_folder)); $this->close(); }
		else  				{ echo 'Could not create a zip archive. Contact Admin.'; }
	}
}

// Add a Dir with Files and Subdirs to the archive
public function addDir($location, $name) {
    $this->addEmptyDir($name);
    $this->addDirDo($location, $name);
}

// Add Files & Dirs to archive 
private function addDirDo($location, $name) {
    $name .= '/';         $location .= '/';
  // Read all Files in Dir
    $dir = opendir ($location);
    while ($file = readdir($dir))    {
        if ($file == '.' || $file == '..') continue;
      // Rekursiv, If dir: toZipArchive::addDir(), else ::File();
        $do = (filetype( $location . $file) == 'dir') ? 'addDir' : 'addFile';
        $this->$do($location . $file, $name . $file);
    }
}

}

$filename = 'pages_backup_'.date('dmy-his').'.zip';

new toZipArchive('pages', $filename) ;

$filepath= $filename; //your folder file path
header($_SERVER['SERVER_PROTOCOL'].' 200 OK');
header("Content-Type: application/zip");
header("Content-Transfer-Encoding: Binary");
header("Content-Length: ".filesize($filepath));
header("Content-Disposition:attachment;filename=\"".basename($filepath)."\"");

while (ob_get_level()) { ob_end_clean(); }
readfile($filepath);
exit;
ob_start ();

?>`