> ---In firebird-support@yahoogroups.com, <vncastanheira@...> wrote :

>

> It should be a nbackup file since it has .nbk extension

  Strong proof :-)

> and created by a tool that uses nbackup.

  What tool ? How it is uses nbackup ?

> Is it possible to recover it, if corrupted?

 
  I don't know.

  Show us output of 

    gstat -h <your_nbk_file>

to make sure it is really zero-level nbakup file.

Regards,
Vlad