Tarsnap is definitely not suited for YC Core. I applied for YC Fellowship -- and only YC Fellowship -- because I wasn't sure if Tarsnap was suitable or not: I

Tarsnap is definitely not suited for YC Core. I applied for YC Fellowship -- and only YC Fellowship -- because I wasn't sure if Tarsnap was suitable or not: I don't know what YC is trying to do with YC Fellowship. (For that matter, it's far from clear that YC knows what YC is trying to do with YC Fellowship.)