Some data created on tape, typically backup copies of data sets, might be uncataloged. Although an application might create a data set with the same name each time it runs, these data sets must be cataloged if they are system-managed. The following three alternatives handle applications that depend on reusing data sets:

• Consider converting these data sets to generation data sets.
• Catalog the data sets, and design a management class that backs them up with DFSMShsm and deletes the data set prior to the next application run.
• Eliminate the application-initiated backup process by assigning a management class that backs up the data at regular intervals.