Using Retrospect with Catalina volume structures in Retrospect 9 or higher for Macintosh Posted November 7, 2019 · Edited November 7, 2019 by DavidHertzberg P.S.: Good to know that amkassir can backup Catalina, wonder why sjmills can't; P.P.S.: short-term solution is to restore using CCC and then overwrite if needed using Retrospect · Report reply amkassir (and others), The "promised 'detail document ...'" is no doubt referring to what Retrospect Tech Support replied to you on or before 11 October 2019. Give the engineers time; this sounds like a tricky Apple-generated problem, and the last sentence of Tech Support's reply at least gives you a hint of what to do if you have to. My guess—as an outsider—is that the time of at least some engineers is currently being occupied with figuring out how to convert the Retrospect Mac (because it's more Unix-related) Engine to run on a Drobo. P.S.: It's good to know, per your post directly above, that you can back up your Catalina installation with Retrospect 16.5. amkassir, do you or did you have external drives cabled to your "backup server" machine—as sjmills does? If so, why does he have problems that you don't? P.P.S.: It sounds—per your post directly below—as if the short-term solution, until the "detailed document" is released, is to restore using CCC and then overwrite files with previous versions—if needed—using Retrospect.