Hi @Arvind Sai,
Welcome to the Atlassian Community!
My understanding is that you would like to have a snapshot of an earlier version of a repository through Sourcetree. In this case, you can perform a git checkout to a specific commit in the branch Master's history.
Just navigate to the commit's history of this specific repository, find the desired version/commit, right-click on that commit and choose Checkout...
After filling in the required fields, your local repository will be at that specific version/commit, so you can create a copy, push it to a different remote, or do anything you would like to preserve that version.
After you have done this, you can simply checkout the HEAD commit once again to have your local repository back to normal.
Cheers,
Mateus T
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