Hello,
This option should be checked.
The Write checksums to media option is selected as a default backup option, checksums are calculated for each data stream written to tape or disk, and then written in a separate stream immediately following the data stream.
During a verify job operation, Backup Exec reads the data stream and re-calculates the check sums and compares it with what is written in the media.
Backup Exec does not compare the files on the tape or backup to disk folder with the files on the hard disk. Instead, it performs a Cyclic Redundancy Check (CRC) verification of the data on the backup media. A CRC performs a mathematical calculation on a stream of data and returns a number that represents the content and organization of that data and uniquely identifies this data stream.
This CRC verification ensures the data was stored correctly and can be re-read.
As additional information please see the technote:
http://support.veritas.com/docs/267554
Thanks,
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