That was maybe here where I asked for information, but never got it. I keep begging people on that bug.
which unfortunately can lead to complicated problems, which are hard to debug, especially without info.
The current issue is off to a better start, but the one-line summaries in the log omit important later lines.
I think the warnings are limited in this log, which again gives a taste but not a full view. If you like, use the log-file=<path> and log-file-log-level options to make a file which you can post in part or full, if you prefer.
Alternatively, if usual methods don’t work and you want a look without ever continuing with an old backup, Recovering by using the Duplicati Recovery tool is more tolerant of issues. You get whatever it can get…