Hi Mohan,

for above you must be take regular back up eithere 

Backup Scenarios:

Hot Backup: To maintain your Oracle within a 24x7 environment with continual access through the UI, you must have the Oracle hot backup enabled. This must be setup and maintained by your DBA in order to comply with your company archival policies. Hot backups allow you to maintain 24x7 real-time alerts and notifications.  Symantec DLP Support will not be able to assist with the setup of a Hot Backup solution.

Cold Backup: Cold Backups allow you to perform scheduled backups without having a DBA involved. During the backup, you will not get real time notification and alerts and you will not be able to log into the UI. Note that incidents will be collected continuously, even during the backup window, and there will be no loss of incidents! Detailed steps to perform cold backups can be outlined by Symantec DLP support.

DLP support does not provide instructions or support for a Hot backup of the Oracle Database files.

For detailes steps refere Symantec DLP maintance Guide. Still find some basic steps

1) stop the vontu services as mention in guide by there serials

2)Take imporatnt backup from Enforce and Oracle DB

3)Start the vontu services

Please refer below most importants Backups

Listed below is a summary of what needs backed up for Vontu.  It is recommended that you reference the System Maintenance Guide for the version of DLP you are using.

The following directories should be backed up on the Vontu Enforce and Detection Servers where applicable:

Logs:                           \Vontu\Protect\logs directory
Keystore:                     \Vontu\Protect\tomcat\conf\
Plugins:                         \Vontu\Protect\plugins
Server configuration:      \Vontu\Protect\config
Incremental scan index:  \Vontu\Protect\scan\incremental_index