Very few changes are required for NetWorker and NetBackup to use disk in your backup system. In Networker, you configure a file type device. In NetBackup, you configure a disk-based storage unit. Then send your backups to that device. It's as easy as that. I would duplicate those backups to tape in most environments, of course.
This topic was covered at length in a previous article of mine in Storage magazine. The big difference is that disk does not need to be streamed, making it wonderful for typically slow backups like incremental backups, transaction log/redolog backups and backups of clients on slow networks.
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This was first published in December 2002