"In the past, it was common to have having multiple untrusted users in one system. Outside of universities that is now uncommon." Is this a personal anecdote o

"In the past, it was common to have having multiple untrusted users in one system. Outside of universities that is now uncommon." Is this a personal anecdote or do you have actual evidence? More importantly your discussion of users/privileges does not take into account separate users for separate processes within the system. Do you think postfix/mysql/apache/whatever-daemon should all run as the same user? Different daemons are essentially different untrusted users and I am glad that unix treats them this way. Without separate users how do you do backups safely and reliably? I am not positive but I think that a modern windows system has different users for different processes..