This report contains two different “Failed to process” message types:
Failed to process file referring to a destination file, which probably happens on verification after backup, and would probably name a destination file. Seeing your Downloading file show the same sized file five times before failing makes me suspect retries. –number-of-retries defaults to 5, but error detail isn’t shown until final failure unless log level is retry, e.g. About → Show log → Live → Retry
Failed to process path would be in source file process and would name one. I don’t think it retries. These are the ones where characters in use was a concern, and I’m not sure where that stands now…
Can you clarify “sparse” (which I can think of as Sparse Files) and “anywhere near” (space, time, etc.)?
Put lines with three backticks above and below – ``` I’m not sure it’s perfect but it can help quite a bit…