Your script should do something like this:

1. Run GBak to Backup
2. Run GBak to restore to another place (that's the only way to verify if
your backup is usable)
3. Watch the output from gbak. It should finish with something like 'going
home'.
4. Run a SP (or some SQL) to update this data on the server. This could be
easily done by isql and a text script

Artur