public function getUsedQuotaMB($round = 2) {
		$size = 0;

		foreach($this->Environments() as $environment) {
			foreach($environment->DataArchives()->filter('IsBackup', 0) as $archive) {
				$size += $archive->ArchiveFile()->getAbsoluteSize();
			}
		}

		// convert bytes to megabytes and round
		return round(($size / 1024) / 1024, $round);
	}