The aggregate group lists the selection data set names, instruction data set name, and additional control information used by aggregate backup in determining which data sets are to be backed up. You create an aggregate group using Interactive Storage Management Facility (ISMF) panels.
The aggregate group optionally contains a management class name that is used to obtain a management class definition that specifies the new aggregate backup parameters.
If a management class is not specified in the aggregate group definition, then DFSMShsm attempts to retrieve the contents of the default management class during aggregate backup processing. If a default management class has not been defined, then DFSMShsm defaults are used. See Management class considerations for information about these defaults.