Backup taking too long time to complete

Info bptm (pid=865) waited for full buffer 171902
times, delayed 190773 times

What we see above is that NBU was waiting for data. Either slow read speed from disk on the client or slow network.

Filesystems on file server  normally get very fragmented over time, which causes slow read performance when entire filesystem needs to backed up.

See this recent discussion for ways to test disk read spead as well as network performance. 
https://www-secure.symantec.com/connect/forums/taking-too-long-time-finish-backup

We have manged to speed up backups for customers with similar issues by enabling multiple data streams in Policy attributes.

If you do the same, separate backup jobs for each of these folders will be generated:

/media/nss/SYS_K1/
/media/nss/VOL1/
/media/nss/VOL2/
/media/nss/IPRINT/
/backup/

You need to ensure that 'max jobs per client is set to 5, change MPX in schedules to 5, ensure MPX in STU is set to 5.

This will kick off 5 jobs, all writing to the same tape drive. 
One of our customers divided job into 8 streams. Backups that used to run from Friday night into working hours on Monday morning completed early hours on Saturday morning.

PLEASE only do this when FULL backup is due, otherwise INC will run as full.