I'd like to have a second calendar, on network (yes again ...), to be considered as backup.
before I mess up everything , I ask the question ; "can I check 2 calendars boxes in options, and both calendars will by synchronized normally ? no duplicates on the Pocket PC "
Do you mean that your remote calendar (backup) will contain the same events as your local calendars ? In which case I think you will have duplicates on your mobile device since your mobile device will contain the events of your local calendar and of your remote calendar.