I did it for a couple of years in the 90s. Head tech at a computer store. I am RELIGIOUS about saving customer data and it got my boss MAD at me so many times.
“Just format it. Go back to factory settings” he’d say.
But I ignored him as much as I could and gave the customer their computer back without the virus, or fixing whatever the problem was most of the time.
Broke my heart when I had to zap it all. (Boss staring me down or if I just couldn’t fix it). I hate lost data.