I cannot remember the specifics but a formula can be found in the NetBackup
Media Mgmt. manual.

Hope this gets you going in the right direction.

Cheers,

jlh
Clovis Khoury wrote in message
news:38e26886@hronntp01....
>
> How much disk space does your catalog occupy?
>
> We will be rolling out NetBackup on NT and I'm trying to estimate the disk
> space used by the catalog. Veritas is telling us that we should size our
> catalog (disk space) based on the capacity of the tape library. I think
> that it should be based on the number of files being backed up. Do you
have
> any figures on this?
>
> Clovis
>