What's also irritating is that onedrive will use some kind of 'smart' caching system to delete the local copy of a file. Which is all fine and dandy until you need said file when you don't have an internet connection. Explaining this to users is very difficult, they just know that something broke and usually when it was very important.

(OK, what's even more stupid is IT departments who don't understand that onedrive has any problems at all, and insist on it and refuse to set up an actual backup system for user devices because 'onedrive will back everything up')

After Onedrive uploads all of your data to the cloud without your consent it sets all files as online only. Meaning the file will not live on your computer unless you click on it, then it will download a copy of that specific file to your system.

If we didn't have criminals in our government right now I would think that this would be a huge anti-trust violation worth perusing.