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Viewing the Windows NT Backup Help file
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Data Protection in Windows NT/2000
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Back up the Windows NT Registry (/b). Verify the backup (/v). Write a backup log to a text file on the C drive (/l c:\backup.log ).
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The command can be called from within a batch file when, for example, you wish to map network drives before running the backup command. This also makes it easy to schedule the backup program to run via the AT or WinAT commands.
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Although complete backups will protect your Windows NT installations even in a worst-case scenario, it is often unnecessary to resort to formatting the hard drive, reinstalling the operating system, and then restoring from tape. The problem may be a corrupt Registry or some other minor problem, such as a corrupt boot file. Windows NT includes the ability to back up the essentials of your system configuration to an Emergency Rescue Disk (ERD) and use it to restore the system if there is some future problem. On a Windows NT computer, this information includes portions of the Registry, the Security database (including all user accounts and groups), and hard disk information. The Repair Disk Utility (RDISK) can be used to back up this data to a floppy:
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To use RDISK, choose Start | Run and type RDISK. The data copied to the floppy is taken from the winnt\repair folder on your hard drive. The files in this directory are automatically refreshed every time you click the Update Repair Info button. Note that this does not back up to your floppy disk you will be prompted to do this after the update is finished. It is very important to maintain regular updates of the data stored on the ERD. Also, as the program will warn you, it is important that you store these diskettes in a secure location, since they include security and account information. Just like backups, the ERD is only current up to the point of the last successful update. Also, note that restoring these files will reset your system to its configuration at the time of the backup. This is especially important when you have changed your disk configuration via the Disk Administrator or have added Service Packs or other OS updates. The data stored on ERDs is specific to each computer, and you should never use an ERD created from a different machine. In the Recovery section, we ll talk about how you can solve simple problems by using the ERD that you ve created.
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NOTE: By default, the RDISK utility does not back up the Security Accounts Manager Database. This is by design, because this database can be very large for environments with many users. However, you can use the rdisk /s command to update this information in the winnt\repair directory and then back up to a floppy.
Enforcing Strong Passwords
One of the main challenges faced by organizations is enforcing the use of secure passwords. No level of configuration will protect against users (and sometimes even systems administrators) that use, for example, their first name for a password. Windows NT 4 Service Pack 3 and later includes a new DLL file (passfilt.dll) that lets you enforce stronger password requirements for users. Passfilt.dll provides enhanced security against password guessing, or dictionary attacks, by outside intruders. Passfilt.dll implements the following password policies: w s Passwords must be at least six characters long. Passwords must contain characters from at least three of the following four classes: English uppercase letters (A through Z); English lowercase letters (a through z); Westernized Arabic numerals (0, 1, 2, and so on); nonalphanumeric ( special ) characters, such as punctuation symbols. Passwords cannot contain your username or any part of your full name.
These requirements are hard-coded in the passfilt.dll file and cannot be changed through the user interface or the Registry. To enable strong passwords, you can make the following changes on your Windows NT systems: 1. Use Registry Editor (regedt32.exe) and open HKEY_LOCAL_MACHINE\ SYSTEM\CurrentControlSet\Control\Lsa. 2. If it does not already exist, add the value Notification Packages, of type REG_MULTI_SZ, under the LSA key. 3. Double-click the Notification Packages key and add the following value: PASSFILT. If the value FPNWCLNT is already present, place the PASSFILT entry beneath the FPNWCLNT entry. 4. Click OK and then exit Registry Editor. 5. Restart the computer. Another useful feature is the option to set the Windows NT screensaver to be Password Protected and set the Wait time to a short duration, such as 15 minutes. This will ensure that if users leave their machines unattended, the workstation will be locked, thereby preventing others from accessing information.
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Data Protection in Windows NT/2000
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