user21970: This question might be a little complex, but here's the situation:
We are a small team and we shoot almost every day, we do correspondence-type shooting. We are backing up our footage to external encrypted drives, there are three now. When I edit, I pull the folders that I want in the edit from the backup drive onto my Editing SSD drive. Because we shoot in MXF and MTS, I usually then transcode everything to ProRes. After that, I delete the original MXFs and MTS' to conserve space.
With this, I end up with duplicated clips on my editing drive. When I edit in Final Cut Pro X, I choose several clips from these folders to be in the final edit from inside the FCPX, and after I render, there are unused, but linked files left behind. I have no way to automatically delete what was not used, and I don't want to delete the folders with transcoded footage if I were to revise the project at a later date.
Is there any way to delete files not used in the timeline? How do I conserve on space? Is there anything in my workflow that could be optimized?

user20675: I am not sure why you end up with duplicates. However you might be interested in having a look at the proxy workflow from Felipe. It probably can help you to get rid of duplicates and conserve space. 

21970: <p>This question might be a little complex, but here's the situation:</p>

<p>We are a small team and we shoot almost every day, we do correspondence-type shooting. We are backing up our footage to external encrypted drives, there are three now. When I edit, I pull the folders that I want in the edit from the backup drive onto my Editing SSD drive. Because we shoot in MXF and MTS, I usually then transcode everything to ProRes. After that, I delete the original MXFs and MTS' to conserve space.</p>

<p>With this, I end up with duplicated clips on my editing drive. When I edit in Final Cut Pro X, I choose several clips from these folders to be in the final edit from inside the FCPX, and after I render, there are unused, but linked files left behind. I have no way to automatically delete what was not used, and I don't want to delete the folders with transcoded footage if I were to revise the project at a later date.</p>

<p>Is there any way to delete files not used in the timeline? How do I conserve on space? Is there anything in my workflow that could be optimized?</p>
 20675: <p>I am not sure why you end up with duplicates. However you might be interested in having a look at the proxy workflow from <a href="https://www.youtube.com/watch?v=U5cjY5NQbMA" rel="nofollow noreferrer">Felipe</a>. It probably can help you to get rid of duplicates and conserve space. </p>
