If backed-up data is to be accessed frequently and must be readily available, DASDtapes are more practical than physical media. If, however, backed-up data is accessed infrequently and disaster recovery is the primary consideration, physical tapes are more practical than DASDtapes.
If both accessibility and transportability are desirable, consider using a combination of DASDtapes and physical tapes. For example, use DASDtapes for your primary backups to meet your restore needs, and create copies on physical media to maintain tapes offsite for disaster recovery.
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