Anurag,

1) install opscenter and use included functionality for reporting

2) use NBU command line,

[root@nbu7 ~]# bpdbjobs -report -gdm
25,17,3,1,,,,,1385714991,0000000001,1385714992,,,,,nbu7,,,0
24,0,3,0,tmp1,Full,nbu7,nbu7,1385714978,0000000014,1385714992,st1,0,0,0,nbu7,37056,127,100

where 37056 is backup size. So easily scripting could give like
clients and their backup size:

# bpdbjobs -report -gdm | awk -F, '{print $7,$17}' | sort

3) export (File->Export) 'Activity monitor' page of Netback
Administration Console to a file and use external tools (speadsheet)
to parse it.

Wed, Nov 27, 2013 at 11:55 PM, Anurag Sharma <sharma.anurag AT hotmail DOT com> 
wrote:
> Hi All,
>
> My query is simple, I have backups going to VTL then duplicated to tape.
>
> Now VTL is filling up badly and need to move some of backups directly to the
> tapes.
>
> Could any one tell me the easiest way to list top 10 backups ( as per their
> backup size ) on VTL storage unit which I can move directly to the tapes for
> the time being.
>
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