I would like to ask for a new gbak switch to avoid data from the specified tables to be included in the backup. It would be useful, for example, to generate backup without data from log tables, etc. In situations like downloading customer DB for debug, those tables may not be necessary, so ignoring its data usually makes the backup file much smaller.
Of course, in standard situations, user needs to take care to not "ignore" data from tables with referential integrity that could make the restore to fail. If you guys think this can be a problem, gbak could be enhanced to check if there would be broken dependencies and return an errorcode.