Try this:
USE_CTIME_FOR_INCREMENTALS bp.conf entry for UNIX clients
The USE_CTIME_FOR_INCREMENTALS entry changes how NetBackup determines
whether or not a file has changed. This entry causes the client software 
to use
both modification time and inode change time during incremental backups 
to
determine if a file has changed. (mtime and ctime.)
Table 3-155 USE_CTIME_FOR_INCREMENTALS information
Usage Description
Where to use On a UNIX client

>From the NetBackup admin guide

Regards,

Pat

------ Original Message ------
From: "mdglazerman" <nbu-forum AT backupcentral DOT com>
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Sent: 19/11/2013 20:12:10
Subject: [Veritas-bu] Incremental filesystem backups running like a full 
backup
>I am attempting to backup the contents of a remotely mounted 
>filesystem. This filesystem is currently mounted on one of our linux 
>master servers via CIFS. There is approximately 2.3TB's of data on this 
>system. I can backup in full with no issues but every incremental I 
>run, runs like another full.
>
>The data I'm trying to backup is located on a commodity storage 
>appliance which has the ability to share itself out over CIFS and NFS 
>etc.. We mounted the CIFS share on a linux box and I created a policy 
>to backup the contents of the mount. I cannot install a NetBackup 
>client on this system.
>
>My plan is to try and implement synthetic full backups against this 
>system to cut down on the backup times. I had another policy configured 
>which via some trial and error, allowed me to run a synthetic full in 6 
>hours instead of 3 days. However, attempts at incrementals using this 
>policy also resulted in the incremental backing up every file again.
>
>The policy currently in use was setup from day one with all the 
>appropriate schedules (standard full, synthetic full and standard 
>incremental) from day one. The standard full ran for 3 days and 
>completed on Saturday morning. I kicked off the incremental that same 
>morning and it's still running.
>
>Are there any caveats to how Netbackup handles backups of remotely 
>mounted filesystems ? I would be very surprised if the system where the 
>data resides is modifying every file every day.
>
>
>Thanks,
>
>Mark
>
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