This feature is a toggle button to turn the backup feature on or off in both Word and Excel. In Word, the command goes to Options and checks the "Always create backup copy":

In Excel, it goes to Browse and then General options in Tools:

In here, the command checks the "Always create backup".

CMD
Since this feature is intended to work as a toggle button, follow the setup for toggle buttons as in this article. This is the command to toggle the backup:
<Cmd case="BaseExtensions:backup" alwaysBackup="X"/>
Parameter
alwaysBackup
Define whether the command should backup using true or false.
Example of module
The code below can be copy pasted into your module.
<ToggleButton label="Backup on/off" pressed="BaseExtensions:any" pressed-1-type="backup">
<True>
<Cmd case="BaseExtensions:backup" alwaysBackup="true"/>
</True>
<False>
<Cmd case="BaseExtensions:backup" alwaysBackup="false"/>
</False>
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