public function save()
    {
        // Update time - now
        $updated = time();

        // Update timestamp
        $this->entries[$this->timestampKey] = $updated;

        // Update timestamp manager
        if ($this->timestampManager) {
            $this->timestampManager->update($updated);
        }

        return (bool) file_put_contents($this->path, json_encode($this->entries));
    }