Hi Les,
Please note we now have a new Brennan Forum
here, Please use this in future or if my help below does not answer your question, please post it again there.
The B2. "Export to USB A or C" function IS incremental in operation. This means that anything new or different on the B2's Hard disk music collection (since the last Export) will be added to the Export being run.
Also
If you have enough room on your external backup HDD for a second copy of your B2's music, you can achieve this by renaming the existing copy (plugging it into your PC to do this). The existing backup directory will be called
"b2export" so if your rename it to be "b2export-old", when the HDD is next used for a B2 "Export" it will create a new ""b2export" on it and you will get a complete NEW, clean backup of your B2's music made.
Fred