Hmm. I think it is akin to the success of Dropbox. Tools like Rsync and binary diffs already existed, but they weren't friendly enough for a lot of developers,

Hmm. I think it is akin to the success of Dropbox. Tools like Rsync and binary diffs already existed, but they weren't friendly enough for a lot of developers, dads, non-tech coworkers, etc to use until Drew Houston wrapped them up nicely in Python. (I vaguely recall him mentioning that on his app even)