Cannot stress more on the part about writing/archiving everything. Relationships between the founders, during the very early days of a startup can swing between extreme brotherhood to extremely sceptical. Everyone is bearing the brunt of pressure and if things are not moving, it is human to delegate the responsibility of performance onto the other guy. I started a content-based startup in my college, and created much of the content myself. The trust that I bestowed upon my other co-founder was futile though. In the end, when things weren't looking up much, he ended up with not giving back the original content to me at all. Since the content was in the form of hand-drawn cartoon strips, I was just left with nothing. I saved up emails, but they didn't achieve much. In the future, the other co-founder tried to do things his way, but he didn't pursue the idea further, and all my hard work of creating just went down the drain. Make sure it doesn't happen to you.