SharePoint Server 2013 backup and recovery supports for Netbackup 7.6

SharePoint 2013 is supported, see page number 24 in below compatablity list

http://www.symantec.com/business/support/index?page=content&id=TECH126904

see the below note:-

The NetBackup client software must be installed on each of the following: the front-end Web server, the SQL database host, and the Index Files or the Index database host. The client software does not need to be installed on the Search or the Job servers.

Only add the client that is the front-end Web server and that runs the Central Administration Service to the policy list.

In addition, please take note that:

NB7.6 starts supporting backup & restore of Sharepoint 2013 in farm level, but not GRT.

For GRT support on Sharepoint 2013, you need to go to NB7.6.0.3

Let us go back to the manuals.

NBU for SharePoint Admin Guide: http://www.symantec.com/docs/DOC6480  
Article:DOC6480     |     Created: 2013-04-30     |     Updated: 2014-04-16

So, the updated doc (2014-04-16)  is now called NetBackup7.6v2_AdminGuide_SharePoint.pdf

Bottom of page 14:

Restores of individual
items and document sets
using Granular Recovery
Technology (GRT)

When a backup uses GRT, users can restore individual lists, items. and documents sets
directly from any full database backup of a Web application. This feature adds an extra
step that identifies the items within the database. This step lets you recover individual items
later. (Note that you must create a separate backup for the full farm.)
Note: In NetBackup 7.6, GRT is not supported with SharePoint 2013. This functionality
will be added in a future release. 

Now we go to the Compatibility Guide that gets updated each time a new NBU patch level is released with new functionality:

NetBackup 7 Application/Database Agent (CL):    http://www.symantec.com/docs/TECH126904 
Article:TECH126904     |     Created: 2010-01-13     |     Updated: 2014-08-11

NetBackup (tm) 7.x Database Agent Compatibility (Updated August 11, 2014)

Look at Release History on page 2.

Then go to the SharePoint section and note the [1] next to SharePoint 2013.

If we go to the footnote on page 26, we see this:

1. GRT support began in NetBackup 7.6.0.3. 

So, this is the  functionality ... added in a future release.   (7.6.0.3)

I hope this is clear now?