code: public function backup()
      {
          if (!is_file($this->filePath)) {
              throw new FileNotFoundException("File does not exist at path {$this->filePath}");
              return false;
          }
  
          copy(
              $this->filePath,
              $this->backupPath . self::BACKUP_FILENAME_PREFIX . date('Y_m_d_His') . self::BACKUP_FILENAME_SUFFIX
          );
  
          return $this;
      }
docs: Create one backup of loaded file
  
  @return DotenvEditor