What file is created during a config backup and what is its approximate size?

The correct answer pertains to the creation of a configuration backup file during the SonicWall Secure Mobile Access process, specifically with the file named "cfgback.aea." This file format is often associated with appliance-generated backups, containing all necessary configurations and settings to restore or replicate the system's state when needed.

In terms of size, while backup files can vary significantly based on what is configured on the device, "cfgback.aea" being around 20MB suggests it holds a substantial amount of configuration data, which is reasonable for a SonicWall device. This size provides enough space for various configurations, parameters, and potentially even logs that can be included in the backup process, ensuring that a comprehensive restoration can occur when required.

In contrast, other choices list file names or sizes that either do not align with the typical naming conventions used by SonicWall or suggest sizes that are not standard for configuration backups, indicating that they are less likely to be correct answers based on typical use and documentation for these devices.