Hello,
As you posted Symantec does not support a hot backup of the Oracle database, a supported backup of Oracle is a cold backup. Within the DOCS.zip file you can download from Symantec Connect w/ the rest of the files is the Oracle Installation guide. There is a chapter dedicated to backup that talks about how to perform a backup of the system.
If you perform a hot backup of the Oracle system and there is a problem with the database or restoration of the database Symantec will not be able to help out. Keep that it in mind if you go that route.