> Yes, again didn't make multiple files, so error happened when size of the
> first .fdb file was 4 Gb.
>
>
>
> This was the last effort:
>
>
>
> "C:\Program Files\Firebird\Firebird_1_5\bin\gbak.exe" -c -se
> localhost:service_mgr I:\Firebird\s6.fbk localhost:I:\Firebird\s6.fdb 500000
> localhost:I:\Firebird\s6A.fdb 500000 localhost:I:\Firebird\s6B.fdb -p 4096
> -v -user xxx -password yyy
>
>
>
> Any suggestions?

Put all switches before db/file specifications.
Do not put "localhost" before filenames, it is already specified in "localhost:service_mgr"