The following error message received when trying to install an M2 extension.
Backup failed Error received from the server: Backup functionality is disabled
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You can enable Backup setting by going to Stores > Configuration > Advanced > System > Backup Setting in Magento admin.
If you want to enable it with the CLI, you can use the below command:
php bin/magento config:set system/backup/functionality_enabled 1
php bin/magento setup:backup --db
php bin/magento setup:backup --code