Yeah... almost nobody uses the 3-2-1 backup strategy (understandably).
Microsoft/Google/Apple, etc. sell that their backup system is bulletproof and that nothing else is needed, and then you get cases like this one. They're generally rare, but still... not funny for whoever didn't prepare for it.
Streamer Joshua Khane recently posted on X, claiming that the company deleted both his Microsoft account and the OneDrive linked to it after it was hacked.