Based on the following in the output:
It looks like your database has a consistency issue. Try running DBCC CHECKDB on that database to see if the same error is reported.
| Quote: |
| SQL error 3043: BACKUP 'Interfax' detected an error on page (1:8650358) in file 'G:\Data\Interfax_DataNew.MDF'. |
It looks like your database has a consistency issue. Try running DBCC CHECKDB on that database to see if the same error is reported.