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SQL Server error code

SQL Server error 3043

SQL Server raises error 3043 at severity 16, which marks a problem with the query or data that you can correct.

BACKUP '%ls' detected an error on page (%d:%d) in file '%ls'.
Msg3043
NameDMP_PAGE_ERROR_DURING_BACKUP
Severity16
Group3000–3999

What it means

This error is raised during a backup operation if SQL Server detects that a page is damaged. Specifically you get this error if the page checksum validation fails during the backup operation. The validation failure is a result of a corrupt database page. A record of the detected bad page would be added to the suspect_pages table in MSDB.

Source: Database Engine events and errors