Here it is :

Extract from OpGuide.pdf :

gbak [-B] [options] database target

Option Description

-b[ackup_database] Backs up database to file or device

-co[nvert] Converts external files as internal tables

-e[xpand] Creates a noncompressed back up

-fa[ctor] n Uses blocking factor n for tape device

-g[arbage_collect] Does not garbage collect during backup

-ig[nore] Ignores checksums during backup

-l[imbo] Ignores limbo transactions during backup

-m[etadata] Backs up metadata only, no data

-nt Creates the backup in nontransportable format

-ol[d_descriptions] Backs up metadata in old-style format

-pa[ssword] text Checks for password text before accessing a database

-role name Connects as role name

-se[rvice] servicename

.. Creates the backup files on the host where the original database

files are located, using InterBase's Service Manager

.. servicename invokes the Service Manager on the server host;

syntax varies with the network protocol in use:

TCP/IP hostname:service_mgr

SPX hostname@service_mgr

Named pipes \\hostname\service_mgr

Local service_mgr