First, you should be sure to shut down your SCM Broker before backing up.
Then, you can use a standard Oracle Export Data Pump command to export the Harvest schema.
For Oracle 11g here’s an article with an overview of how Data Pump works: https://docs.oracle.com/cd/E11882_01/server.112/e22490/dp_overview.htm
For information about syntax:
http://docs.oracle.com/cd/B28359_01/server.111/b28319/dp_export.htm
A very basic export command would look like this:
expdp systemadmin DUMPFILE=dumpfilename.dmp SCHEMAS=schemaname
where:
systemadmin = Oracle userid that has the “EXP_FULL_DATABASE” role assigned. The “system” user would normally be used here.
dumpfilename.dmp = the name of the dump file to be created.
Schemaname = the name (userid) of the Harvest schema.
Let me know if you need more information.