It is expected that the caches of the repositories will be larger than the repo itself as per our Supported Platforms document, but it is not expected this would take more than 2 or 3 times of the repo size.
Is this an SVN repository? For a SVN repo this might happen if the Symbolic Rules are misconfigured. If this is the SCM you are using, please take a look at the SVN tag and branch structure document ensuring the structure of your repo matches the definition of the Subversion Red Book, or in case the structure is different, that your Symbolic Rules are properly configured.
If the structure of your repository is different of the convention, it would matter, possibly making the caches growing more than expected, so you would need to configure the Symbolic Rules as per the instructions in the SVN tag and branch structure document. This is further explained under How Subversion works in the same document.
Additionaly, for reference, I'm sending a document regarding disk space consumption, in which the recommendation to check the Symbolic Rules is also included among the resolutions proposed: https://confluence.atlassian.com/pages/viewpage.action?pageId=280069520
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