Be aware, the NetBackup 6.x be will EOSL soon. As per Symantec, NetBackup 6.x will reach End of Support Life (EOSL) by 3 October 2012. So, in order to continue receiving NetBackup support from Symantec, upgrade to NetBackup 7.x its highly recommended.
Click link below for more detail:
SAIFUL AZIZ's BLOG 