When you use NTBackup to backup your NT partition (and other partitions), files that are in use may be bypassed. You can backup inuse files by editing the registry at:

HKEY_CURRENT_USER\Software\Microsoft\Ntbackup\Backup Engine\Backup files inuse

and setting the value to 1. The default is 0 - do not backup inuse files.

You should also edit:

HKEY_CURRENT_USER\Software\Microsoft\Ntbackup\User Interface\

Skip open files     this type REG_SZ has 3 possible settings:
    0 = do not skip, wait
    1 = skip files that are opened unreadable
    2 = wait on open files for Wait time

Wait time     this type REG_SZ has a range from 0 to 65535 seconds with a default of 30 seconds.

Certain files will not backup because NT has them open. Others will backup but will corrupt upon restore. The proper way to backup is:

.  Run RDISK /S-  to backup the registry to the %SystemRoot%\repair directory.
   The /S causes the %SystemRoot%\Repair directory to be updated, the - prevents an ERD from being created.

.  Disconnect users from shares and stop all Services that have databases open
   such as WINS, DHCP, Exchange, SQL, etc.. See tip 159.

.  If backing up network workstations or Servers, use tip 072 to backup their registry.

Combine the above with tip 013 for the best freeware approach to backup.

For a much more robust and flexible backup, try the fully functional UltraBac evaluation.