Yap.....I have found while Xara Web Document weights around 3.76 MB, the saved Internet page is only 36.1 KB. Now I'm not scared abymore if Xara Document Save File doesn't get empty (and lose it's MB) even if I delete all the content of the pages I'm making (which doesn't seem normal to me but never mind).

The video tutorial is so precious, by the way!!! I'll use that info when making the further pages.