'Remove unused media from pool' - What exactly is removed?

I lost important media files using this feature. Partly my fault since the backups I thought I was doing missed these files, but also party Cubase’s fault. What I had done was to create a template from a project, and the template ended up including some clips in its pool. I finally got tired of removing those events so I went to clean up the template. As part of that, I used the remove unused media from pool feature, however, because those clips were unused in template it deleted them, but it didn’t warn me that those same clips were used in other projects and were not trash! By then they’d been completely deleted, not even to moved to my Mac’s Trash. I tried almost everything I could think of to restore them (once I realized my backups were incomplete), but without success. Lesson learned.