Thankfully I have enough spare computers that I can backup on other machines without losing valuable space, so I do so.
I have 2 or 3 copies of my music collection, project files, and any irreplaceable data, with each copy being on a different hard drive (for sure) or even on a different computer. My web server currently doubles as a backup machine. I never sit at it, but it's running 24/7, allowing me to copy anything I want to it, in private folders.
If any of my computers decided to die right now, I wouldn't actually lose anything except the time to reinstall.