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The first step in determining a good data protection plan is to decide how you are going to perform backups. There are several different ways to configure your systems to protect information. In this section, we ll look at the most common methods local and remote backups and some less common methods that might give you some ideas for your own environment. Keep in mind that you can use several different backup scenarios in a single data protection plan.
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If you back up files on your home computers, you re probably using a tape backup drive attached to that machine. This is as efficient as you can get when only one or a few machines are available and you have to make copies of your information. In this situation, a tape backup drive is directly connected to the local machine via a parallel port, IDE, SCSI, or other interface:
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Users install tape backup software and then either back up on-demand or schedule the operations to occur at regular intervals. Generally, backups occur relatively quickly since there is no network to pose a bottleneck. Additionally, backup devices can be purchased inexpensively based on the amount of information that must be protected. Performing local backups becomes less efficient when you have to manage several machines. The main problems are with administering the solution. Each backup drive and software program must be configured and managed separately. Also, the costs can get quite high when you must purchase and install multiple tape backup units in your PCs. Still, in a networked environment, you might want to choose a local backup system if you have only a single server or a few servers and cannot afford to invest in larger, centralized storage systems.
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Remote backups are those in which information on one machine is protected by a backup solution on another machine. The other machine might be a dedicated backup server, or it could be a standard file/print server that is also responsible for backup functions (see Figure 2-2). Generally, data is transferred over the network. Based on your requirements, you might choose to back up client workstations or multiple servers over the network.
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Figure 2-2.
A remote backup solution
Here are some of the major benefits of remote backups: w Ease of administration Since all management can be done on one or a few machines, systems administrators need only log on to one console to see how operations are occurring. Lower costs Having a few larger backup solutions can be less costly to purchase and implement than the many independent units required for local backups. Transparent to users Cataloging and managing media is simplified and can be handled by trained IT staff instead of end users.
Disadvantages of performing remote backups include the load that is placed on the network. When backup operations are being performed, other users on the network may experience reduced performance. Perhaps more significant is the load that is placed on
SQL Server 7 Backup & Recovery
the backup server itself. Saving information to tape drives increases both the disk I/O system processing load. Using a separate server that is dedicated to performing backups can alleviate some of these effects. However, backups are generally performed during off-peak hours. Furthermore, for fast backup solutions, the network can be a bottleneck. Overall, however, most organizations find that the benefits of managing backups centrally outweigh the potential performance impact. When developing a backup plan, it s important to consider factors that relate to the manageability of your solution. Specifically, you ll want to know how much time and effort it will take to back up essential information for your organization. There are several important considerations, the most crucial being how best to administer the solutions and where the information should reside. Let s look at two major issues: administration and storage.
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