Netbackup SQL servers - QOS?

We currently are backing up our sql servers using Netbackup, however netbackup is utilizing a ton of bandwidth to perform the backups.  We have a project in place to rectify this at the server level, however in the interim, is there any way to limit the amount of bandwidth utilized by Netbackup when connecting to SQL Server?

I've read some tech notes on using a LIMIT_BANDWIDTH setting, however it stated it wouldn't apply for SQL backups.  Is there any setting, whether in the backup batch file, client, etc. which would throttle the bandwidth utilized during backups of SQL server?

Thanks