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Copy Backups
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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.
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Daily Backups
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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.
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Combining Backup Types
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Although creating a normal backup every night ensures that a server can be restored from a single job the next day, a normal backup might take too much time to create, perhaps causing the overnight job to last well into the morning, thus disrupting performance 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:
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Normal and differential backups On Sunday a normal backup is performed, and on Monday through Friday nights, differential backups are performed. Differential 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 need
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Backing Up Data
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to restore the normal backup from Sunday and the differential backup from Thursday. This strategy takes more time to back up, particularly if data changes frequently, but is easier and faster to restore because the backup set is on fewer disks or tapes.
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Normal and incremental backups On Sunday a normal backup is performed, and on Monday through Friday incremental backups are performed. Incremental backups clear the archive attribute, which means that each backup includes only the files that changed since the previous backup. If data becomes corrupt on Friday, you need to restore the normal backup from Sunday and each of the incremental backups, from Monday through Friday. This strategy takes less time to back up but more time to restore.
Practice: Performing Different Backup Types
In this practice, you will create several backup jobs, examining the role of the archive attribute.
Exercise 1: Create Sample Data
1. Open Notepad and create a text file with the following lines. Type each line carefully.
md c:\Data net share data=C:\Data md c:\Data\Finance cd c:\data\Finance echo Historical Financial Data > Historical.txt echo Current Financials > Current.txt echo Budget > Budget.txt echo Financial Projections > Projections.txt
2. Save the file as c:\createfiles.bat including the quotation marks. 3. Open the command prompt and type cd c:\. 4. Type the command createfiles.bat. 5. Open Windows Explorer and navigate to the c:\data\finance directory. You should see the following display:
Lesson 1
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Fundamentals of Backup
6. If the Attributes column is not visible, right-click the column headers Date Modified and select Attributes. The archive attribute is displayed.
Note
Leave Windows Explorer open on C:\Data\Finance. You will refer to it throughout this practice.
Exercise 2: Perform a Normal Backup
1. Open the Backup Utility by running Ntbackup.exe from the command line or selecting Backup from the Accessories System Tools group on the Start menu. 2. Clear the Always Start In Wizard Mode check box. 3. Click Advanced Mode. 4. Click the Backup tab. 5. Expand My Computer, the C drive, and then the Data folder so that you can select the Finance folder. The Finance folder has a blue check mark, meaning a complete backup, whereas its parent folder has a dimmed check mark, indicating a partial backup. Any files added to the Finance folder will be included in the backup, but any files added to the Data folder will not. 6. On the Job menu, choose Save Selections. 7. Save the selections as Finance Backup.bks. 8. In the Backup Media Or Filename box, type c:\backup-normal.bkf.
Note In production environments, you will be likely to use removable media for backups, but to keep hardware requirements to a minimum, practices in this lesson will back up and restore using local files. If you have access to a tape drive, feel free to use it during these practices.
9. Click Start Backup and then click Advanced. 10. Confirm that Normal is selected in the Backup Type drop-down box, and then click OK. 11. Select Replace The Data On The Media With This Backup and click Start Backup. 12. Observe the Backup Progress dialog box. When the backup is complete, click Report. 13. Examine the report. No errors should be reported. 14. Close the report and the Backup Utility. Note that in Windows Explorer, the Attributes column no longer shows the archive attribute.
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