1. the list of tables always backed up is blank, the column for tables I may include is actually the core wordpress tables that should be backed up.
2. In both cases: selecting the 'may include' list and not selecting the 'may include list' result in screen headed 'DO NOT DO THE FOLLOWING…' with a blank progress bar, and no progress at all.
I tried it with Save to Server and Download to your computer'.
No backups made.