This happened when I was attempting to run a full farm backup using the Central Admin GUI backup utility. This was the first attempt at backing up our environment.
Here is a screenshot of what appears in Central Admin
Object “database name” failed in event OnBackup.
For more information, see the error log located in the backup directory.
SqlException: Cannot open backup device ‘\\
\”backup directory”\spbr001F000000B.bak’. Device
error or device off-line. See the SQL Server error log
for more details. BACKUP DATABASE is terminating abnormally.
This turned out to be a DNS issue between our database server and our SharePoint server. Our SharePoint server was not registering properly in DNS. It was pointing to an internal DNS server so we changed our SP server to point to the correct DNS server. A simple fix for a not-so-simple error message.