> interesting... why do you want to keep using gbak 1.5 with a 2.1 database?
> if you have a 2.1 database you need to be running server 2.1 to use it, and
> therefore have ready access to the correct gbak version...

I don't want to work that way. It is because I discover that GBAK 1.5 can backup Firebird 2.1 database and that make me curious. I worry some data might not backup properly if this happen.