Volumes for file generation groups

File generation groups can be stored on public or private volumes (disks or tapes). When selecting the type of volume, the user should consider the purpose for which the FGG is to be used: is it, for example, to be used for long-term storage of book-keeping data or for managing the backup copies of files created as part of regular processing (such as updating master data) or created by regular save operations in a computer center?

If an FGG is created on private disks, all generations of this FGG must also be on private disks. In contrast to this, the mixed use of pubsets and tapes is permitted.