In a post of a few days ago I mentioned the potential risk of automatic updates: You might distribute something that doesn't work any more, irritating customers, which is A Very Bad Thing™.
Now, before an auto-update is installed, everything it modifies is backed up, allowing the user to revert to the previous version with a click of the mouse. This should not just make the customer relaxed about installing updates, it gives me peace of mind as well.
