Back when I used OneDrive, it deleted an important but seldom used folder. It just wasn’t there anymore. No one noticed for 6 months, but luckily I had kept a backup each month so could restore it easily.

3 weeks is definitely not long enough for me to notice something missing, if it’s just a random chunk of my 700GB of important stuff. E.g. if a folder of my kids photos from 5 years ago suddenly disappeared, I probably wouldn’t notice it for months but would be devistated to find it missing when I eventually went looking for it.