[Microsoft SQL-DMO (ODBC SQLState: 42000)] Error 3202: [Microsoft][ODBC SQL Server Driver][SQL Server]Write on '\\xxx.xxx.xxx.xxx\backups\mytable_db_200505150505.BAK' failed, status = 112. See the SQL Server error log for more details.

[Microsoft][ODBC SQL Server Driver][SQL Server]BACKUP DATABASE is terminating abnormally.

Most probably your disk is full (98% cases), thou it also might mean I/O error, broken or too long cables, bad SCSI driver etc.

Also check:

http://support.microsoft.com/default.aspx?scid=kb;en-us;325334