You should back up HiRDB files in frozen update status at least once. The management area of HiRDB files that are not in frozen update status is used regardless of whether data pages are being used. Even if the database condition analysis utility (pddbst command) is executed and the results indicate that no HiRDB files are in use, be sure that you always have a backup of the HiRDB files.

The status of the HiRDB files changes only when the frozen update command is executed. If a HiRDB file does not have full data pages when the frozen update command is executed but its data pages become full later after data has been added, its status will not change (that is, it will not change to frozen update status). The status of such a HiRDB file will change only if you execute the frozen update command again after the file's data pages have become full.