Retrospect has now been working again for some time.
Old time Mac users, will remember Retrospect as the go-to Mac backup program. However, Retrospect fell on hard times as a sequence of new owners seemed more interested in milking revenue from the customer base, than investing in a quality product. There was a period of literally years, where it was junk.
However, now that it has been spun off and is no longer part of some big company, it now is working again, and each new release seems to bring improvements. Hopefully, they will reform their pricing model, which still charges a very hefty premium for backing up any Mac running Apple’s $19.99 server app. Still, it is now, again, a program that you should consider.
I am looking forward to seeing what this new version brings.