I did a large scale data rationalization and migration project for a company that is heavily regulated. They can be asked to prove they have this or that document from seven years ago, for no other reason than they should have it. Not having it means big fines and negative press.

Hundreds of Tbs of data got appropriately labelled and migrated, even more got left behind on the old system till it could be decommissioned safely after a period of parallel running.

As part of the decommissioning the data was backed up twice, and I wanted the backup properly tested with some random file restores. Not a full restore, just a few random restores just a proof of life test that the backups worked. I was told that wasn't a reasonable request and it wasn't needed as the architect in charge of backups trusted his backup team and he "designed pragmatic solutions".

I still mean to call in to the regulator in a year or two to trigger a restore request, lets see if a pragmatic solution design is actually the same as performing some basic testing.