jherbstmallorca :
Does nobody perform a backup anymore before changing the OS?
Well, considering that for some users, the issue was their OneDrive, which they used to back up files, WAS what was deleted, people might be understandably pissed.
Additionally, MS may recommend that users do this, but if they were serious, they'd add it as a prompt when asking to install an update ("Backup, install update and restart" or something).
Oh, and most importantly: Non-tech savvy users have been told to update their system to keep it safe for well over a decade, and for a lot of users, it's finally hit home. It doesn't occur to them that they aren't doing the right thing by applying every update (and some non-tech savvy users might even check for updates out of an abundance of caution).
I can fully understand automatically applying security updates automatically and with minimal user consent, but given the issues MS has had with its last few feature updates, they really need to separate patches vs. major updates that can cause problems.