I came to notice that the first commit of open source projects already show complete versions. However, in my opinion it would be good to have a history before the first functional version. Particular to understand the code.
Some examples of repositories showing my point:
https://github.com/python-git/python/commits/master?page=1179
https://github.com/angular/angular.js/commits/master?page=125
I have a huge amount of important information in my gmail account. Of course I could backup that info to be even safer. But I'm wondering is there some estimate of the real probability of gmail of losing your data? I guess it is almost null.