C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c
localhost:c:\backups\test22.f
bk localhost:c:\backups\new1.fdb -user SYSDBA -password masterkey
gbak: ERROR: cannot open backup file localhost:c:\backups\test22.fbk
gbak: Exiting before completion due to errors

C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c
localhost\\c:\backups\test22.
fbk localhost\\c:\backups\new.fdb -user sysdba -password masterkey
gbak: ERROR: cannot open backup file localhost\\c:\backups\test22.fbk
gbak: Exiting before completion due to errors

C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c
localhost:c:\backups\test22.f
bk localhos:\c:\backups\new.fdb -user sysdba -password masterkey
gbak: ERROR: cannot open backup file localhost:c:\backups\test22.fbk
gbak: Exiting before completion due to errors

C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c
localhost:c:\backups\test22.f
bk localhos:c:\backups\new.fdb -user sysdba -password masterkey
gbak: ERROR: cannot open backup file localhost:c:\backups\test22.fbk
gbak: Exiting before completion due to errors

C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c
localhost:c:\backups\test22.f
bk localhost:c:\backups\new.fdb -user sysdba -password masterkey
gbak: ERROR: cannot open backup file localhost:c:\backups\test22.fbk
gbak: Exiting before completion due to errors

C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c
c:\backups\test22.fbk localhost:c:\backups\new.fdb -user sysdba
-password masterkey

C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c -user sysdba
-password master
key -se localhost:service_mgr c:\backups\test22.fbk c:\backups\new5.fdb
gbak: ERROR: unavailable database
gbak: ERROR: failed to create database c:\backups\new5.fdb
gbak: Exiting before completion due to errors

C:\Program Files\Firebird\Firebird_1_5\bin>gbak -c
stargazer:c:\backups\test22.f
bk localhost:c:\backups\new.fdb -user sysdba -password masterkey
gbak: ERROR: cannot open backup file stargazer:c:\backups\test22.fbk
gbak: Exiting before completion due to errors

C:\Program Files\Firebird\Firebird_1_5\bin>

As you can see, as soon as you provide BackupPath as simple
"c:\backups\test22.fbk" (without any computer/Server Name), it works.

This is not good for me.

Thanks,
Ashok