Looks like a read error to me. I'm having similar "Cannot decode block" errors every now and then, but on older hardware (DLT), and have never been able to figure out the cause. Quite often I am able to read on a second attempt.
Can you read this very saveset (recover it)?
Can you clone it manually?

Regards

I've not tried to recover or clone the saveset manually after a failure, as the error seems to indicate an issue with the original. After starting the failed savesets again a second (or third) time, I eventually will get a successful backup + clone.

I had a bit of success with last weeks full after separating the two savegroups that were giving me problems. They used to run nearly concurrently. Hopefully, the success will hold for this week as well.

Thanks for the response. I wish you luck with your errors also.

Dave