Release 10.1A: OpenEdge Data Management:
Database Administration

> ## CRC codes and redundancy in backup recovery

> To recover corrupted backup blocks, PROREST relies on:

> - CRC codes to identify bad blocks. A CRC code is automatically calculated for each database backup block whether or not you specify a redundancy factor.

> - Error-correction blocks to recover bad blocks. Error-correction blocks are included in the backup only if you explicitly request them with the -`red` parameter of the backup utility.

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