Note Ntbackup is dependent on the service Removable Storage, and if the service doesn't respond, then Ntbackup will fail to start.
[HKEY_CURRENT_USER \Software \Microsoft \Ntbackup \Backup Engine]
Logical Disk Buffer Size = "64" (Default 32)
Max Buffer Size = "1024" (Default 512)
Max Num Tape Buffers = "16" (Default 9)
Note one might have to start NTBackup before the default values are created, and one should make sure to create the settings for the user account used for doing the backup.
More Info Backup Process Used with Clustered Exchange Server 2003 Servers
More Info MS KB104169
More Info MS KB233427
More Info MS KB300439 (How to use command-line)
More Info MS KB308422 (How to backup files)
More Info MS KB309340 (How to restore files)
More Info MS KB320820
More Info MS KB814583
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