Exchange Backup

[may]

I have windows 2000 server with service pack 2 up to exchange 2k

i want to know how to tack on line backup to my exchange server

i tried it from w2k system tools + backup it gives me the following error

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NTBackup Error None 8001 N/A MAIN

End Backup of 'MAINMicrosoft Information StoreFirst Storage Group' Verify: Off Mode: Append Type: Normal


NTBackup Error None 8012 N/A MAIN The 'Microsoft Information Store' returned 'Error returned from an ESE function call (d).

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thanks
may