No, that's not possible because they are not files and what you describe is not a backup. The explanation is very technical. It suffices to say that what you describe is impossible to achieve with any tool within any degree of accuracy. It all has to do with the way articles and categories reference assets entries which, in turn, reference ACL groups and privileges. The way the whole content and ACL system works in Joomla! makes it impossible to take a bunch of articles and transfer them to another site in a way that makes you 100% confident that the transferred articles will display, retain the correct ACL privileges and link to each other correctly. FYI, what you describe is actually called "site synchronisation" or "content synchronisation", not "backup".
Nicholas K. Dionysopoulos
Lead Developer and Director
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