What's your worst ever data loss / what event caused you to start properly backing up your data?

For me as a musician it was losing my only copy of around 12 months worth of music I'd recorded, track files and all.

It was over 10 years ago but I still feel an intense sting and sense of loss that those pieces of music are something I'll never get back. I literally cried my little heart out when I realised it wasn't coming back.

At the time, I was 17 and couldn't afford any kind of advanced data recovery service.

It's been a slow process, but now, all my PC's/Laptops are backed up via Veeam to my file server, which itself is backed up via Veeam to an external hard drive and also backed up to Crashplan... not 100% infallable but I sleep easy knowing that even if my file server dies and somehow takes the USB drive with it, I've got it all in the cloud.