Oracle SOA Cloud Service ensures that backups contain only the volumes that are needed for a proper restoration of a service instance.
Therefore, the following items are not backed up:
Users' custom volumes
The $JDK_HOME volume, which contains the JDK software
Software binary files in the $MW_HOME volume
Oracle SOA Cloud Service does not back up the database to which it is connected. If you are using a database that supports backups such as Oracle Database Cloud Service, you can coordinate the backups to occur on the same schedule as Oracle SOA Cloud Service. Similarly, if you use Oracle SOA Cloud Service to restore a service instance from a backup, you can also separately restore the database from a backup taken at the same time.