Re: Backups, backups, backups!
Yep, backups do work, whether for corporate data or personal machines. It's little things like installing a new OS version yesterday and finding it borks some vital software, even if the testers didn't spot it at the time. (I'm not naming names, because it can happen with any new OS).
How to repair, simples, you've got a backup, just find the last sane version and restore.
You haven't, oh deary, deary me.
Your New Jersey data center gets flooded - you have offsite backups somewhere a bit higher? Fantastic.
Despite ALL the warnings someone in PR downloads a famously virus-laden email and infects half the company (true story) - you have decent backups? Yes, excellent.
JFDI, it's not bloody rocket science.