Of course you can only recover files from the git repository, when you have commited them - and you are only able to recover the latest version of a file you have commited ...
See for example:
If the file was not indexed by Git, your OS may provide some recovery tools http://windows.microsoft.com/en-us/windows7/recover-lost-or-deleted-files
Or you can try 3rd party apps that will scan your hard drive for deleted data: http://www.lmgtfy.com/?q=recover+deleted+files
Supported Platforms macOS Windows To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
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