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Some of your users might well be incompetent computer users and wont pass the "test".
I have often thought about why people dont do backups even when the new tools are easy for most to handle. I think the reason is psychological in nature.
Backup implies that you are at least cognizant of the impending disaster scenario. many people avoid even thinking about this, why think of bad news?. Engineers are accustomed to this way of thinking, its a different mental makeup, we shouldn't assume the general public shares this point of view, especially since most of the time they are led through their computing experiences by "wizards" and "guides" might as well be priests.