Philisophic difference. In our apps we try and let the user have choices how to do those type of things and we try not to force it, although I admit there are times we do indeed force it when the user has too much riding on the opton.
I would prefer the FAA make a backup rather than forcing me to have it copy my entire project and folders elsewhere. The problem with copy mode is twofold: it takes a long time to copy and it is unlikely that al the parameters and environent wou;ld be replicated sufficiently enough to let the copy project actually work. I would assume most developers use source control as well. which cn mame a mess when you just copy things. OTOH I understand your fear of somebody emailing you "how do I undo this when I hae no backup".