Thanks for your bug report. This is the intended behaviour. The installer will only make one backup and that will be of your current settings. There was a time, in 1996, when the installer created a new backup at every install. This resulted in some users, who ran the installer regularly, having a very large, and ever increasing, number of backup folders. Users complained about the behaviour, so it was changed to the current behaviour. I could change this back again and limit it to a small number of backups, say ten dated backup folders at most. That would resolve the issue for users who perform several installs one after the other and would still prevent a build up of backups. I have added this to my to-do list.
