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What is SVN, GIT, mercurial, etc.?

I have a question, and this name, from the fact that I know that they have something or somewhere to store files over the Internet, so you can get it from anywhere as long as you have the Internet, but why does it exist many types of them? if all they do is the same as storing files, and then you can also restore them.

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There are no backup systems; they manage versions.

You can use Git or mercurial on your computer without an internet connection. There are two main ideas behind this:

  • Track the history of what you did (find which change made the mistake, undo the crappy change ...)
  • : , , .
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Source Control:

http://www.ericsink.com/scm/source_control.html

Git Mercurial , . . , :

http://hginit.com/

Mercurial, , .

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As stated in more detail in the other answers above; svn, git and mercurial are source control technologies. That is, to save files. And perhaps access via the Internet. They are not designed specifically for sharing files over the Internet.

Services specifically designed for sharing files on the Internet, DropBox , JungleDisk, or even old-fashioned FTP, and sometimes illegal p2p, such as BitTorrent.

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