I'll try and get back to it sometime. I've spent time writing words instead of code at home recently. Question: Do you want to download the archive pages exactly as they are (easy) as plain text with no markup (fairly easy) or as the contents of the post with its internal links but without the template structure - as in the edit box (harder).

The first two could be done with any website; the last one would be more work, though I could do it in a blogger or blogger pro specific way.