From v5 to v6

All keys in the config file are now snake_cased. Rename any camelCased keys to their snake_cased counterparts.
Make sure the structure of your config file is the same as the one that gets published by the package.
The health_checks config keys now contain actual check classes. Modify your config file so it uses the actual check classes.

From v4 to v5

The config file has been renamed. Change the name of the config file from laravel-backup.php to backup.php