Hi There.
I have 3 years+ of work in basecamp - a collaboration and todo list website -
and it will be taken down soon. I really don't want to lose all of that work,
so I would like to download all of it using HTTrack. It is all my content, so
completely legal. Everything is behind a password protected page - but I can't
seem to authenticate properly even after reading the authentication section of
the manual.

Can someone point me in the right direction? 

URL: <https://calendarhero.basecamphq.com/login/>

Much appreciated.