Part of a good backup solution involves ensuring that it's literally impossible for the "root" / "administrator" whatever user on the production system to delete the backups. For instance, were this AWS, it would be done by creating a separate AWS account and use IAM roles to provide access to a S3 bucket with the "DeleteObject" permission explicitly denied. Perhaps, even deny everything except something like PutObject, and ensure the target S3 bucket is versioned, so even overwriting the contents with garbage is recovered by restoring a previous version.

But most businesses don't think like that.