Steps: 1. Create virtual server, turn on all the features.
2. After its done, whoops, didn't want the http features on this one, open up "edit virtual servers" then "enabled features" and turn off the http related stuff.
3. And here is the problem: The checkbox for "Webalizer reporting enabled?" just won't turn off.
Which causes the backup report to end up in my mailbox every day for "error in backup"...
To fix, go to /etc/webmin/virtual-servers/domains and edit the configuration manually (change webalizer=1 to webalizer=0 on that domain file) fixes all of it.