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Exam Tip
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As you explore each backup type, keep track of how the archive attribute is used and treated by the backup type. You will need to know the advantages and disadvantages of each backup type and how to fully restore a data structure based on the backup procedures that have been implemented.
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All selected files and folders are backed up. The archive attribute is cleared. A Normal backup does not use the archive attribute to determine which files to back up; all selected items are transferred to the destination media. Every backup strategy begins with a Normal backup that essentially creates a baseline, capturing all files in the backup job. Normal backups are the most time-consuming and require the most storage capacity of any backup type. However, because they generate a complete backup, normal backups are the most efficient type from which to restore a system. You do not need to restore multiple jobs. Normal backups clear the archive attribute from all selected files.
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Selected files with the archive attribute set are backed up. The archive attribute is cleared. Selected files with the archive flag are transferred to the destination media, and the flag is cleared. If you perform an incremental backup one day after a normal backup has been performed, the job will contain only the files that were created or changed during that day. Similarly, if you perform an incremental backup one day after another incremental backup, the job will contain only the files that were created or changed during that day.
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Lesson 1
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Fundamentals of Backup
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Incremental backups are the fastest and smallest type of backup. However they are less efficient as a restore set, because you must restore the normal backup and then restore, in order of creation, each subsequent incremental backup.
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Differential Backups
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Selected files with the archive attribute set are backed up. The archive attribute is not cleared. Because a differential backup uses the archive attribute, the job includes only files that have been created or changed since the last normal or incremental backup. A differential backup does not clear the archive attribute; therefore, if you perform differ ential backups two days in a row, the second job will include all the files in the first backup, as well as any files that were created or changed during the second day. As a result, differential backups tend to be larger and more time-consuming than incremen tal backups, but less so than normal backups. Differential backups are significantly more efficient than incremental backups as a restore set, however. To fully restore a system you would restore the normal backup and the most recent differential backup.
Copy Backups
All selected files and folders are backed up. Copy neither uses nor clears the archive attribute. Copy backups are not used for typical or scheduled backups. Instead, copy backups are useful to move data between systems or to create an archival copy of data at a point in time without disrupting standard backup procedures.
Daily Backups
All selected files and folders that have changed during the day are backed up, based on the files modify date. The archive attribute is neither used nor cleared. If you want to back up all files and folders that change during the day without affecting a backup schedule, use a daily backup.
Combining Backup Types
Although creating a normal backup every night ensures that a server can be restored from a single job the next day, a normal backup may take too much time to create, perhaps causing the overnight job to last well into the morning, thus disrupting perfor mance during working hours. To create an optimal backup strategy, you must take into account the time and size of the backup job, as well as the time required to restore a system in the event of failure. Two common solutions are:
Normal and differential backups On Sunday a normal backup is performed, and on Monday through Friday nights, differential backups are performed. Differ ential backups do not clear the archive attribute, which means that each backup includes all changes since Sunday. If data becomes corrupt on Friday, you only
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