async _saveFile(filename, content) {
		try {
			if (this.storage) {
				await this.storage.saveFile(filename, content);
			}
		} catch (ex) {
			this.emit('debug', `Error saving file ${filename}: ${ex.message}`);
		}
	}
@param {string} filename
@param {Buffer|*} content
@return {Promise}
@protected