After DFSMShsm recovers or restores a data set, the settings for
the last-backup date are as follows:
- If a new name has been provided for the data set, the last-backup
date is set to zero.
- If a new name has not been provided for a non-VSAM data set and
the data set was recovered from a backup version, the last-backup
date is set to the backup date of the version being recovered.
- If a new name has not been provided for a VSAM data set and the
data set was recovered from a backup version, the last-backup date
is the value set by IMPORT or DFSMSdss, whichever recovered the data
set.
- If a new name has not been provided and the data set had been
restored from a dump copy, the last-backup date is the value restored
from the dump copy.