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Most network installations use a third-party software product to perform backups, but you should familiarize yourself with the functions of the Windows Server 2003 Backup program, even if you do not intend to use it.
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Creating a Backup Plan
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Once the hardware and software components for your backup solution are in place, the next step is to create a plan that contains elements such as the following:
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What data will be backed up When backups will occur Which tapes to use and when
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Selecting Backup Targets
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The easiest way to perform backups of your network is to simply back up all the data on all your computers every day. However, in most cases, this is not a practical approach for reasons such as the following:
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There is too much data to back up. The hard drives that are typically included in today s computers hold more than ever, and on a large network, total storage capacity can easily add up to thousands of gigabytes. Unless you want to spend an enormous amount of money on tape drive and autochanger hardware, it would not be possible to back up all the data in every computer every day. There is not enough time to perform the backups. Most network administra tors schedule network backup jobs to occur at night, or whenever the organization is closed. Backing up during off hours makes it less likely for the backup to skip files because they are locked open, and minimizes the impact of the network traffic gen erated by remote backup processes. For some organizations, the amount of time available to perform backups (called the backup window) would be insufficient to back up the entire network, unless multiple high-speed drives were used. There is too much redundant data. Much of the data stored on a typical com puter s hard drive is static; it does not change every day. Application and operat ing system files never change, and some document files can go for long periods without users changing them. Backing up files like these every day means saving the same data to tape over and over, which is a waste of time and media.
For these and other reasons, backup software products enable you to be selective about the files you back up. As a rule, you should back up every day only the files that change every day, such as frequently used data files. Files that change less frequently are best served by a weekly, or even a monthly, backup. Some operating system and application files need never be backed up because, in the event of a disaster, you would have to reinstall the operating system and applications from your original distri bution disks anyway.
Tip Ease of backup is one of the primary reasons that many network administrators insist that users store their data files on servers, rather than on their local hard drives. By giving each user a home directory on a server, it is possible to back up everyone s data files with a single server backup, rather than having to configure the backup software to connect to each individual workstation every day.
Most backup software products enable you to select backup targets in two ways, by
checking files and folders in a directory tree display (see Figure 6-16) or by using fil
ters. Filters enable you to select the files you want included or excluded from a backup
Lesson 3
Planning a Backup Strategy
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by specifying a combination of factors, including file names, extensions, dates, sizes, and attributes. For example, you can select an entire folder containing your Microsoft Word files for backup, and then exclude all the backup copies that Word automatically creates by applying a filter with the file mask Backup*.*.
Figure 6-16 The Windows Server 2003 Backup Utility window
Understanding Backup Job Types
To simplify the process of backing up only the necessary files, backup software prod ucts enable you to select different types of backup jobs. The three most common types are as follows:
Full backup Copies all the selected files to the backup medium and resets the archive bits for all the copied files Incremental backup Copies only the selected files that have archive bits, and then resets those archive bits Differential backup Copies only the selected files that have archive bits without resetting those archive bits
The archive bit is a one-bit flag (called an attribute) on every file, which backup software products use to determine whether that file has changed recently. When you perform a full backup, the software resets all the archive bits for the files it has copied to the backup medium by changing the bit values to 0. Later, whenever an application modifies one of these files, it sets the archive bit for that file by changing its value to 1. The next time you perform an incremental or differential backup, the software checks the archive bits of the files targeted for backup and copies only those with archive bit values of 1. The result is
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