Steinbergusers.com: how to delete unused audio files?

Hi, I'm using Nuendo 3
I guess this is a simple question..

When I'm recording, supose I'm recording in a track called Audio1
So I make 10 takes.. I get Audio1_01,Audio1_02,...,Audio1_10

Now supose I am making a mix, and in the project I only use Audio1_10. The other ones are not good, I delete them in the project.

But after this, and saving, and exiting, when I see the folder Audio, the 10 takes remain there.

So the question is what option or what should I do so Nuendo only keeps in the Audio folder the takes that are present in the mix, deleting "trash". It's mainly because of disk space.. I have allways to go and delete unused takes in the folder mannually, and looking to the project to see if I'm not deleting used takes!

Thanks!

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