That appears to not work, it immediately halts execution on teh first error it receives.
Here's the command I'm executing:
nnbackup -i d:\ -s -o \\192.168.1.240\backups\d\ dump 4 -ax h -ax s -ll 1 -nozip -log \\192.168.1.240\share\backup_logs\backup_log_d.txt -v
This command works (I get the same error, but it continues backing up the rest of the files) (note -c used instead of -ll 1):
nnbackup -i d:\ -s -o \\192.168.1.240\backups\d\ dump 4 -ax h -ax s -c -nozip -log \\192.168.1.240\share\backup_logs\backup_log_d.txt -v
It does show the error message though, so I guess I should stick with the -c option?