Because of orbital mechanics, anything that would be traveling faster than the scaffold would be at a higher orbit and wouldn't be able to be caught.
The exception to this would be if the object were in an elliptical orbit, which would allow for contact to be made with the scaffold at its perigee, which be impossibly rare.
One more question: Has BlobBackup been tested with hundreds of thousands, to millions of files in a single backup archive? I've had issues with backup software in the past choking during backup/restore with a very large number of files.
Have you thought about adding CLI support to the roadmap? If you were to add that it would be an instant buy for me, as well as many other admins, I'm sure.
Great product though! Always happy to see projects like this