Every school in the Trust has a 10 TB NAS for onsite back ups via windows back up, one school has a 100TB NAS for all other schools offsite back ups via windows back up and one has a 40TB nas for the offsite back up of the school with the 100TB back up, had some scripts made by a friend that outputs to a PHP site we can check the outcome of all the various backups in one central place. Cost - just the hardware.