Detail Specific Errors in Log Section
When a backup fails I have to go into the individual log files and see the exact reason that I got a FAILED or INCOMPLETE notification.
Your logs detail what happened.
I suggest that all errors get reported to the log files in the GUI to avoid having to further research.
Alternatively, provide a link in the GUI next to the log message where that log file can be opened from right there and the exact error can be seen in the logs.