iTunes backs up your entire iPhone for free.
That is, unless you're not actually talking about "back[ing] up" and mean that you want to get the data off your iPhone to import it into something else and mess around with it some more, which is completely not the same thing at all and a misuse of the word. I don't see why FileMaker has any obligation to provide that sort of functionality with anything other than their own products; which this already does. I mean, would Pocket Access for Windows Mobile be expected to sync with anything other than Access for Windows? Surely not, so why apply a different standard here? And what product are you proposing to do that in, if any?
Bento for iPhone is an extension of Bento for Mac, not the other way around.
And it also works on its own.