Older versions of Revit rarely used has large files remaining in CollaborationCache

[Jmorrison]

I have older versions of Revit on my workstation that haven't been used in a while and see that the 'CollaborationCache' still has a lot of large files eating up 10GB of my disk space. See example of files in attached screenshot. 

Are these not temporary files uses for worksharing which Revit automatically deletes over time? 

[RSomppi]

I empty that folder periodically. I don't think Revit deletes them automatically.

[Jmorrison]

Thanks for your reply. I had heard that there might be a risk to losing information in the model if it's deleted manually. 

[RSomppi]

The only risk is if the local files have not been synchronized with central. They are local files just like the ones that are created for non BIM 360 projects.