I had advised the site director about backups. He assigned someone to look after the job, but despite this, no tapes were swapped.
As predicted the server failed; and the drives were the cause. No tapes swapped, despite my forceful admonitions, so no restore possible. I arranged for the tapes to go to a specialist recovery place; meanwhile, built a new server ready for the data. Got about 85 - 90% back at a cost of about £1400.
You'd think that they had learned their lesson, but oh no. Still no tapes being swapped. So I ended up running a remote backup process, D-2-D-2-T. That seemed to be the only way to prevent a recurrence. Over the next 5 years, didn't lose a single file.
I left the company and I'm told that the overseas parent company demanded they take control of everything. That included backups and they insisted each site manage their own process. About 2 years later, they had a server disk fail and no-one noticed. When a second drive failed, they lost all of the data, because no-one had swapped tapes!