Onbar & restore

Hello I've just started using onbar and omniback, so forgive me if the question is basic. I created a level 0 backup. Now I'd like to restore this. When I restore, what I think happens is that onbar salvages the log onto the same device as where my dbspace backup was. So once the logs are savaged, I get the message 'there are no dbspaces/blobspaces to restore/backup'. How do I tell omniback and onbar to salvage the logs somewhere else ? Thanks Deepa