Affected NV Version: All
OS Version: All supported Windows
Plugin version: 3.2 and older
Application version: All supported Informix
Best practices for Informix backup duplication.
Under some circumstances a restore from duplicate tape fails. Therefore, Data Copy Plugin is recommended to make a copy of backups.
When an Informix backup and its duplication job are configured with the Migration option set, the migration fails and restoring data using duplicate tape is impossible. The data can't be restored from original tape either if the tape isn't scanned before index the is overwritten.
The situation gets worse when the migration option was not used AND the original tape is manually reused/blanked before its original data expiry, because the saveset information in duplicate tape disappears from NVDB at the same time original index is removed from NVDB (either by media being blanked/reused). The situation can happen in the following scenarios.
* Original tape is blanked/reused [and overwritten] after the phase2
duplication, and before the backup life of original data expires.
* Data Copy plugin is used for duplication with "Duplicate a backup" option selected, not "Copy a full backup to produce a new independent copy of the data" option.
Create independent backup index for the Informix data using Data Copy plugin with "Copy a full backup to produce a new independent copy of the data" option selected.