Note that the rules about when incremental backups are taken will vary from installation to installation and your installation may even have different rules for different datasets.
By looking at the information in the format 1 DSCB, you can also find out if a dataset has been changed since the last backup was taken. It helps if you have a product like "StarTool" or the shareware PDS command.
You can get specific information about who and when by reviewing SMF type 15 records (for non-VSAM datasets).
DFHSM can also restore an older version of the dataset under a different name which will allow you to compare the two versions to see what changed.
Of course, this is no substitute for good change management but it can be useful if things somehow fall between the cracks.
Last Month's Topic