All the information is there on tapes. On the other server, you simply would need to run a catalog job to recreate the catalogs on disk, so that you can start with restore. But, this would be a lengthy process. So, it is always good to have the on-disk catalogs protected. These catalogs are typically locted under c:\program files\symantec\backup exec\catalogs folder. So, it would be advisable to retain a good copy of this folder, so that in case of disaster, you can build a new server and simply copy this folder over to the new server, and you will not need to run catalog operation separately and that saves your time. So, to summarize we have two copies of catalog, one on tape and one on disk. Catalogs on disk are required for restore. If lost, you can run catalog job on tape to get them back.
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