You can load SBCON from the server command line.
If you use NWBACK32 on a client, you do not need to load SBCON.
At the server console, enter
SMSSTART
TSA600.NLM, TSAPROXY.NLM, and SMDR.NLM modules are loaded with default configuration values.
SBSC.NLM, QMAN.NLM, SMSDI.NLM and TSANDS.NLM must be manually loaded on need basis; SBSC.NLM, QMAN.NLM, SMSDI.NLM when storage devices are used, and TSANDS.NLM for backup and restore of eDirectory.
Load SBCON by entering
LOAD SBCON
See Loading Controller and Storage Device Drivers on the Server.
They should have been installed automatically during NetWare 6 installation.