Backup for Internet DNS service. Email will bounce with an unknown host message. Secondary will automate retries 4 hourly for 3-4 days. SU and CUC both use HP3000. AU CS backup daily to disk all files touched in last 2 days, to a day named file.
Makes restore easy to do, no tape to mount, operator can do it even from home.
Weekly do total backup to tape. How to verify tape restore files randomly from throughout the tape and do a compare. A real life, a user request to restore a file can be a good test. Off-site storage of backup media. This arrangement needs to be with a trustworthy body.