Need examples to show management that these are used for source control and effectively backup of projects.
They will be concerned about having their source code off-site. If there are good examples I think that it may help in convincing them to consider this as an option.
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GitHub is proprietary and is hosted on GitHub.
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Your a bit out of luck there, as there’s no way to gain insights into private repositories. Luckily, GitHub does have support for organizations and Bitbucket has an equivalent support with teams.
For no particular reason, I can give you an example of Engine Yard as one of the organizations that are using GitHub, but with a bit of repository browsing I’m sure you can find other businesses closely related to your niche that have a presence on one of the two.
I’m unable to find any adequate published sources right now, but I do have an understanding that their in-house support and maintainers do not have access to repository particularities such as source files, which is what I believe one of the main concerns would be for hosting your sources on remote services.
While I can’t give you examples of companies using github for hosting, I can suggest some other arguments you could use in favour of using it.
One of the major advantages of distributed version control like git or mercurial is that each repository is a full or almost full backup. So you’ll have central server hosted and managed by someone else, but even if anything catastrophic happens and github goes out of business, the damage will be quite limited.
You can also note that administrator you’d otherwise have will certainly be less experienced than the ones in big hosting company like github and thus your own server is actually more likely to fail. Because in a big server farm, individual servers die now and than, so all recovery procedures are tested. While with own server it will work fine for some years, so when it fails you can easily find yourself with broken backup or missing bits or such.