Full and incremental backup

The same rules apply to node files as for BS2000 files.
With incremental backups, the entries in the directory file marked “CNS” (cataloged-not-saved) are interpreted as “still present in node file system but not modified since the last backup”.

A full backup of S0 or of the most recent backup in the archive is performed like any full backup. HSMS always saves the most recent version of the metadata (ownership and access rights, time stamp and other file attributes).

The type of backup is controlled via the SELECT-FILES operand of the HSMS statement BACKUP-NODE-FILES. Specifying SELECT-FILES=*MODIFIED-FILES or *BY-CATALOG-MODIFICATION results in an incremental backup, while SELECT-FILES=*ALL-FILES produces a full backup.