Netbackup Catalog Creation

Just taken over an Old 5.1 NB server, and I have a problem with catalogue, everytime i try to use bpsyncinfo -dobackup it downs the drive, i have an engineer going to look at that...

But what I would like to do is write the catalogues to disk, and I am not having much luck with bpsyncinfo... should i be specifing a path as i cant really add a media id..?

Bit Confused...

Thanks

Burty...