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To do this, copy the ESEBLCI2 dll files from the Exchange 2003 install CD to the EXCHSRVR\BIN folder on the  backup server. Add the key "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\BackupRestore\DLLPaths  REG_EXPAND_SZ - esebcli2 - c:\exchsrvr\bin\esebcli2.dll" to the registry. From NTBACKUP, select "remote store" under "tools."  " Select a folder to save the backup to and give the backup a name. Decide whether to verify the data after the backup. This will take longer, but ensures a successful backup. It will show what percentage is complete as it runs. Check the event log to see if it was there were any errors during the process.
Install Exchange System Manager on the backup server or modify the server to back up a remote Exchange server. Press the start key and select run. Type the command "NTBACKUP. Follow the prompts to the next screen. Wait for the backup to run.