As per Microsoft, the backup data on the indicated media is incorrectly formatted. The likely cause is that a backup was interrupted, leaving the end of a disk backup file in an improperly terminated condition. The specific meaning of this error depends on the context in which it is returned:
- When returned in response to a backup statement, this error indicates that the operation failed and the backup was not created. Pre-existing backup sets on the media may be damaged and unusable.
- When logged in the error log, the message may be in response to a backup operation or to a restore operation. In response to a backup operation, this error may be a warning, as when you try to append a backup, or the error may indicate that the application failed. When this message appears in the error log for a restore operation, it is a warning message; the operation succeeded, but, other backup sets on the media may be damaged and unusable.
See the link to Troubleshooting Error 3266 for additional information.
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