Hi Bruno Michels,
Thank you for using our services.
The version tables store data for different versions of your content items. The sf_VrsBinData stores binary information for versions of content items. The binary data is library items' content - images, documents, videos, etc. You can reduce the sizes of those tables by deleting items you can run scripts against the db which will delete content from those tables. You can find samples on how to achieve this in the following KB article
Also if for some module you do not use versioning you can disable this feature. The KB article has a sample on how to disable this for News.
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