如何使用Plesk API下载Plesk服务器备份？

Question

According to the documentation I have to use the following code:

<packet>
    <backup-manager>
        <download-file>
            <server></server>
            <filename>backup_info_1903291320.xml</filename>
        </download-file>
    </backup-manager>
</packet>

However, when I execute the script I get the following error

Allowed memory size of 134217728 bytes exhausted (tried to allocate 65019904 bytes)

Ive tried to set the memory limit in PHP.

ini_set('memory_limit', '-1');

But that doens't work either, it runs out of memory.

Out of memory (allocated 524288000) (tried to allocate 520097792 bytes)

Did I execute the request correctly? Other requests work fine, like requesting a list of backups. Only trying to download it breaks my code. I hope a Plesk expert can help me out here.

This is the code I wrote:

class Plesk_Synch
{
    private $node1;

    private $node2;

    public function __construct()
    {
        $this->node1 = new \PleskX\Api\Client( 'IP_OF_THE_SERVER' );
        $this->node1->setCredentials( 'username', 'pass' );

        $this->node2 = new \PleskX\Api\Client( 'IP_OF_THE_SERVER' );
        $this->node2->setCredentials( 'username', 'pass' );
    }

    public function init()
    {

    }

    public function download_backup()
    {
        $request = <<<EOF
<packet>
<backup-manager>
   <download-file>
    <server></server>
    <filename>backup_info_1903291320.xml</filename>
   </download-file>
</backup-manager>
</packet>
EOF;

        return $this->node1->request($request);
    }
}

$plesk_synch = new Plesk_Synch();

// Download backup
$plesk_synch->download_backup();