Skimming thru a recent issue of Radio magazine, a sidebar says that Minnetonka has updated Bronze. discWelder Bronze 1000m now automatically duplicates DVD-A content into the DVD-V zone. Sounds cool!
Also beware to trash any files or folder where Chrome and presumably discWelder Bronze puts files in the "Temporary Directory" each time one creates a disc image or burns a disc otherwise there are Dolby encoding error's. Just dealt with this last night.
Another option for backing up one's DVD-Audio's is DVDFab where you can back up the just the DVD-V side or better yet an exact back up. A back up DVD-Audio with DVDFab will play the DVD-A section on players/software that do not recolonize the watermark such as Oppo players. You can and should copy the whole disc and just play the DVD-V section if your player does recognize the watermark.