About 3 years ago, my girlfriend had this laptop that she got from her University. She had to give the laptop back to get reset, but didn't want to lose all of her data on it, and a backup would be around 750GB.

So I suggested that I would backup the laptop (was thinking to just dd an image and go from there). So I plugged in my mobile USB and external hard drive, and started the imaging process. Given the amount of data and setup, the process should have taken about 5hours. So we left it there for 5h.

Please be mindful that at this stage in my life I knew very little about boot processes, oses, and hardware.

5h after. The laptop screen is black and it ain't responsive. Not sure what happened, the dd process was completed, but the laptop refused to boot into windows. Tried a number of boot tools, and spent a crazy night hacking at the machine. But the university had some of sort of fail safe to not allow anyone to boot into windows if someone opened bios without entering a password. Whatever this was, I spent over 12h trying to either open mount the windows partition with a Ubuntu usb or mount the corrupt dd image on my laptop.

Long story short, after throwing at it a number of fixes. I was able to mount the image, copy out all of her personal data, and reinstall a new version of Windows on her laptop. The university didnt understand why the laptop was already reset. She still mentions this to me anytime I want to take a "custom approach" to software lol