Catalina Bug?
 

I just saw on the Mac Rumors site that the developers of CCC have reported a bug with the latest version of Catalina released yesterday that is blocking bootable backups and I wondered if this will impact SuperDuper users as well?

https://www.macrumors.com/2020/05/28...table-backups/

Yes, we know (and had also reported a bug to Apple about this), and we're working on a workaround. Existing backups from 10.15.4 work fine and can continue to be Smart Updated to 10.15 5.

I'm part way through a blog post that I'd hoped I wouldn't have to write, since I expected Apple to fix the bug...but, unfortunately, they released.

Here's the blog post about it