Well, ive kept investigating myself...
So when the project says it has no database, it means you can delete emails from the db folder and see what happens..
I killed everything until 2014, and "resumed" and so it avoided the large email
How is it that it can back up a big email but not restore it?
Anyway, I also had trouble with paths on windows. Forward slash, back slash.. Who knows.
What ever I tried with -d to point to the folder failed. So I did a fresh install and copied the emails to the standard folder hierarchy. Then it worked. But a shame I couldnt move the 30 gigs to a large second drive.
Last point. As every email is zipped, you cant easily search anything on windows. Be lovely to do that. I could have avoided restoring them all together
Andrew