By now we assume that around 10,000 workers (maybe a lot more) were notified of their "last day" or simply "locked out" (in the name of 'security'; one day you're a trusted company 'asset', the next ...

Some years ago PCLinuxOS Magazine (https://pclosmag.com/) suffered a security breach. It had to restore from a very old (years-old) backup, then piece together the publications, which was a huge task.