Original issue was on the backup destination side using NFS, unable to list the files. We worked on this:
System.IO.IOException: Input/output error
at Duplicati.Library.Main.BackendManager.List () [0x00049] in <9d37c106a6af4e2db9ebdc93583bad34>:0
New issue is on the backup source side, which I don’t think I knew was also remote. This particular issue needs some chasing down by someone, possibly someone who can run strace to see what’s interrupted:
EDIT: skip-metadata=true was also mentioned, and is easier test. Just set the option true to see if it helps.
FileAccessError while processing files explains the need for investigation, and ideally a reliable test case.
You’re pretty busy now trying to get things running right, but if you can help investigate, it might help solve.