c# generate barcode image Part 8: Windows Server 2003 Disaster Planning and Recovery in Visual C#.NET

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Part 8: Windows Server 2003 Disaster Planning and Recovery
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As part of your backup strategy, you ll probably want to perform normal backups on a weekly basis and supplement this with daily, differential, or incremental backups. The advantage of normal backups is that they are a complete record of the files you select. The disadvantage of normal backups is that they take longer to make and use more storage space than other types of backups. Incremental and differential backups, on the other hand, use less space and are faster because they are partial backups. The disadvantage is that recovery of systems and files using incremental and differential backups is slower than when you only have to perform a normal backup. To see why, consider the following backup and recovery examples:
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Microsoft Windows Server 2003 Inside Out
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Normal backup with daily differential backups
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You perform a normal backup every Sunday and differential backups Monday through Saturday. Monday s differential backup contains changes since Sunday as does Tuesday s differential backup, Wednesday s differential backup, and so on. If a server malfunctions on Thursday and you need to restore the server from backup, you would do this by restoring the normal backup from Sunday and then the differential backup from Wednesday.
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Using Media Rotation and Maintaining Additional Media Sets
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As part of your backup strategy, you might also want to use copy backups to create extended backup sets for monthly and quarterly use. You may also want to use a media rotation scheme to ensure that you always have a current copy of your data as well as several previous data sets. The point of a media rotation scheme is to reuse tapes in a consistent and organized manner. If you use a media rotation scheme, monthly and quarterly media sets can simply be media sets that you are rotating to offsite storage. Consider the following media rotation scenarios:
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Media rotation with three weekly media sets and one monthly media set
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In a 24/7 environment, you use a total of 14 tapes as a media set. Seven of those tapes contain your normal weekly backups for a set of servers. The other seven tapes contain your daily incremental backups for that set of servers one tape for each day of the week. Three weekly media sets are maintained on site. Once a month, you rotate the previous week s media set to offsite storage. terly media set In a 9 to 5 environment, you use a total of 14 tapes as a media set. Nine of those tapes contain your normal weekly backups for a set of servers. The other five tapes contain your daily incremental backups for that set of servers one tape for each workday. Three weekly media sets are maintained on site. Once a month, you rotate the previous week s media set to offsite storage. Once a quarter, you rotate the previous week s media set to offsite storage.
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Media rotation with three weekly media sets, one monthly media set, and one quar-
Backing Up and Recovering Your Data
Windows Server 2003 includes a backup utility called Backup that was developed by Veritas Software Corporation. Backup is a versatile utility designed to perform backups of individual systems. You use Backup to perform the following tasks:
Create backup archives of files and folders Create backups of the System State Create Automated System Recovery backups
Part 8: Windows Server 2003 Disaster Planning and Recovery
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Part 8: Part Title
Backup and Recovery
Access media pools reserved for Backup Restore archived files and folders Restore the System State
You can also use Backup to schedule recurring backups. Scheduling backups gives you the ability to create a backup job once and then run it repeatedly. For example, you could configure a backup job to run daily, weekly, monthly, or on an ad hoc basis. The only disadvantage of scheduled backups compared to manual backups is that you ll need to remember to change the media as necessary, so that backups are written to the proper media as per your rotation scheme.
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