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Although the overwhelming majority of virus scares are bogus, viruses do present a very real threat to your network. These simple pieces of code are designed to quickly replicate throughout your network and can cause problems ranging from mild annoyances to system-wide data loss. Unlike the stories that are common in science fiction and tabloid media, viruses rarely render machines unbootable or cause widespread disk corruption. The more common viruses are those that are included in macros (in Microsoft Word or Excel documents, for example), and those that simply do nothing other than replicate between machines. There are many tools that can be installed for protecting against viruses on clients and servers. Some utilities allow you to automatically scan your machines during a network login. Keep in mind, however, that some forms of virus protection can be much more trouble than they re worth. For example, performing a virus scan at every login can be a waste of time and resources and can lower productivity. On the client side, certain virus-scanning utilities automatically scan all files whenever they re accessed. Again, this
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NOTE: In Windows NT and Windows 9x usernames are case-insensitive. However, Windows NT passwords are case-sensitive. Windows 9x does not support case-sensitive passwords, but the authenticating server retains the case information. This is important if the user will also use a Windows NT computer, because case-sensitivity will then be enforced.
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can significantly reduce performance. For more information on virus protection tools and technologies, see any of the following websites: w s s s v Symantec s Norton Anti-Virus McAfee Anti-Virus Center Sophos Anti-Virus F-Secure Anti-Virus Norman Data Defense Systems www.symantec.com/nav/index.html www.norman.com/tb/tbav.htm www.mcafee.com/centers/anti-virus
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In many cases, doing a single full backup and then backing up selective files will be adequate for meeting the requirements. For example, if you have 10GB of data to back up, but only a small portion of this changes, it would be most efficient to have a full backup and then subsequent backups of only the files that change. As we discussed in 2, Developing the Data Protection Plan, there are three main types of backups: w s v Full backup Stores all files on the selected partitions. Stores all files since the last full backup. Stores all files since the last full or incremental backup. Differential backup Incremental backup
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Differential and incremental backups use the archive bit, which is stored for every file in the file system (whether NTFS or FAT). Full and incremental jobs always reset the archive bits for any files that they back up. Differential backups do not reset the archive bit. You should not mix full and incremental backups. Incremental backups are often faster than differential backups, but restoring incrementally takes longer, because all tapes in the series must be loaded sequentially. Differential backups will store more data on each backup, but restorations will only require the full backup and the last differential backup. We covered the topics of determining business requirements and establishing policies in previous chapters. At the very least, you should have answers to the following questions before implementing any data protection operations: w s s s s v How much data will you need to back up How much tape/other storage space is available Should operating systems and applications be backed up, or should only user data be stored Will any data on users local machines be backed up, or must they store all data on the servers How much data changes daily Weekly Monthly What are the business requirements regarding time for a complete restoration
Using this information, you can define an appropriate schedule for backing up files. Figure 3-2 shows a method that includes reusing tapes and storing information offsite.
3:
Data Protection in Windows NT/2000
Figure 3-2.
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