Backing up a storage group returns the following error:
ACN5798E MS Exchange API HRESEBACKUPREADFILE() failed with HRESULT: 0xc7ff1004 - Error returned from an ESE function call (-1018)
The -1018 error is returned to Tivoli Data Protection by Exchange itself, and indicates a possible checksum error in one of the databases in the storage group in question.
Resolving the problem
Here are links to three Microsoft support articles that document possible reasons for returning a -1018 error during a backup operation, and possible resolutions for this behavior:
This link is still active as of 12/08/2013:
After the corrective actions have been taken, test the backup again to see if it runs successfully.