Which command is used to create a backup configuration?

The command used to create a backup configuration is the one that copies the current running configuration to the startup configuration. This is a common practice in network management, particularly for devices like routers and switches, to ensure that the current settings are saved and restored upon a reboot.

When you use the command to copy the running configuration to the startup configuration, you effectively save all changes made during the session, allowing for a stable state to be preserved. This makes it easier to restore the configuration after a restart or failure, as the startup configuration is read from memory upon booting up the device.

In contrast, the other options do not serve this purpose. For instance, commands that reference 'running backup' or 'config mem' are not typically recognized for saving configurations, while 'wr mem' is more related to older syntax. Understanding the correct syntax and function of these commands is crucial for effective device management and configuration integrity.