The verify or compare function is used to read the backup from the server and compare it to the hard disk as if a restore was taking place. Each bit is compared to make sure it was not corrupted during the backup, while writing to the media, or during transmission to the client machine.
Once the verify is started from the server, click on the agent item in the task tray to view the verify process. If files are found to be corrupt, a detail log is written in the catalog directory entitled changes.cmp.
To increase the number of not backed up files to allow before the system considers a backup as failed and does not perform a verify, edit the value for VerifyIncompleteFileCnt in the master.ini file under Configuration > Settings > Media information.