This is the command thats used to backup on the 1.5 server

/opt/firebird/bin/gbak -b -t -user sysdba -password pass /ibdata/stock.fdb /opt/firebird/fbbackup/stock.fbk

So looks like we were already using -t for transportable

--- In firebird-support@yahoogroups.com, Cornie van Schoor <cornievs@...> wrote:
>
> On 2011/01/13 05:14, crizz11 wrote:
> >
> > HI all, trying to migrate from firebird classic 1.5 32bit to 2.5 64bit
> > on linux. Whenever I try to do anything on the new 2.5 64bit server
> > with database files from the old 1.5 32 bit server i get the following
> > error. " gbak: ERROR:file /ibdata/stock.fdb is not a valid database "
> > This was an error i got when trying to backup the database that i
> > simply copied from the 1.5 server to the 2.5 server. I have also tried
> > copying a .fbk file from the 1.5 server over to the 2.5 server and got
> > the same error when trying to resore. Is it possible to switch from
> > 32bit 1.5 classic to 64 bit 2.5 classic or is there something i have
> > to do to the database files first?
> >
> Do a transportable backup on the 1.5 and then a restore on 2.5
>
> regards
>
> Cornie
>
>
> [Non-text portions of this message have been removed]
>