In this case, it would have been deleted anyway. I think I can see the loss: 1. Start zip. 2. In parallel, copy the intermediate zip file. 3. Delete the zip 4

In this case, it would have been deleted anyway. I think I can see the loss: 1. Start zip. 2. In parallel, copy the intermediate zip file. 3. Delete the zip 4. Delete originals The data was deleted in step 4 and is the loss. It notably would also had occurred had the zip terminated early or not zipped _all_ the files for some reason. The process was not resilient.