Which is quite of an issue for me because i had a projects folder inside the hub installation folder. I was "quite surprised" seeing that the folder was gone after updating unity hub. I do backups on a weekly basis but since i just started working on the project at the end of the last week, my first backup was scheduled to tomorrow. My loss isn't really the end of the world but it's a bit annoying. I'm not sure if there is a warning but it would be great to see a option that makes it impossible to continue updating without checking a checkbox to notify the user about this (atleast the first time you update it) or change the "uninstall behavior" so it doesn't delete non unity hub related files. Nevertheless, I won't make the same mistake again.