Last semester, I spoke with a graduate student who was almost done writing his thesis and then--you guessed it--his computer crapped out on him!
Unfortunately, he didn’t have a backup. His reasoning? "I’ve never backed up, not even as an undergrad and I never had a problem before.”
Above all, avoid the wishful thinking that because you’ve never had a virus, been a victim of ransomware attack, never driven your car over your computer, or had an untrained puppy pee on it that it could never happen to you.