Howto convert saved webpage archives back to single files ?

This is kind of a presales question while evaluating the product.

If i ever give up on Apple, how can i get my saved web pages out of the system and back to an platform independent format? Is there a simple export function that can run automated over all pages?

Neither DEVONthink nor Safari support this. Therefore I would recommend a different file format to save web pages, e.g. plain/rich text, formatted notes (HTML) or PDF.