|Message:||%1: %2 failure on backup device ‘%3’. Operating system error %4.|
|This message indicates that an I/O error was reported by the operating system after a file handle was successfully opened. The error occurs when reading from or writing to a device specified as part of a BACKUP or RESTORE command, often when there is not enough disk space available for a write operation. This error may also be seen if third-party software that uses a virtual device to perform SQL Server backups cancels the operation.|
|The steps to take will depend upon the operating system error received.