c# generate barcode from string 14: Recovery and Backup in VS .NET

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14: Recovery and Backup
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Overview Modern computer hardware is reliable, and it is unusual that a computer system crashes completely and needs a complete restoration. Typically crashes are hardware-related, and you can replace a hardware component and even an entire motherboard while keeping system and user files on your hard disk intact. Nevertheless files, folders, and even entire volumes can be lost, sometimes through user error, through disk failure, or because a virus forces you to wipe the hard disk. Recovery and backup, therefore, remain core components of an IT professional's job. Welldocumented procedures on production networks are typically in place if a server recovery is required and servers are often grouped in failover configurations. If user data is not held and backed up centrally, then regular backups of essential files on client computers need to be scheduled. These should happen without user intervention, preferably late at night when the backup does not impinge on the user experience. In this chapter, you learn how to back up both files and folders and system images, and to schedule backups so they occur automatically at a specified time. You learn how to quickly restore a vital file that a user has lost or overwritten. You learn how to create and restore the system image of an entire system volume. Exam objectives in this chapter:
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Configure backup. Configure system recovery options. Configure file recovery options.
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Lessons in this chapter:
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Lesson 1: Backup Lesson 2: System Recovery Lesson 3: Recovering Files and Folders
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Before You Begin To complete the exercises in the practices in this chapter, you need to have done the following:
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Installed the Windows 7 operating system on a stand-alone client PC, as described in 1, "Install, Migrate, or Upgrade to Windows 7." Added a second hard disk to your computer. This can be an internal hard disk or an external universal serial bus (USB) disk formatted with the NTFS file system. You need at least 20 GB of free space on this disk.
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REAL WORLD Ian McLean Many people use the terms backup and copy interchangeably. When I finish working on this chapter tonight, I'll copy it to a USB flash drive that I'll store in a separate location from my computer, so that if the computer crashes or is stolen, I haven't lost my work. On a weekly basis, all my user files are backed up automatically to an external hard disk that I can plug into another computer if necessary. In both cases, I'm protecting my data. So, what's the difference When a file is backed up, its archive attribute is set. If the file is not altered, it will not be backed up again during a scheduled backup. If there's more than one user using a computer, a backup backs up all the users' files. A standard user can copy only his or her own files. File copying can't save registry settings or other system settings. File copying can't create a complete image of a computer or a system volume. Backups are compressed and take up less disk space than copies. Compression during backup and decompression during restore happen automatically and are invisible to the user. You cannot use the Restore Files Wizard to restore files you have copied. Copies aren't marked as previous versions. You can't restore them using the Restore Previous Versions feature. You can copy files from any medium to any medium. You can't back up files that are stored on FAT media. You can back up files only to a hard disk (internal, external, or network drive), optical media, a virtual hard disk (VHD), or another computer. Finally, you can copy files that you have encrypted. You can't back up encrypted files. However, there lies the rub when it comes to copying. Should you, as an IT professional, encourage the users you support to copy their files You instinctively support the notion that users should be aware of the need to protect their data (at least I do), but the press just loves stories of lost USB flash drives containing confidential information. (It's quite easy to lose optical disks, too, but it seems to be flash memory that excites the journalists.) Either ensure that all users encrypt their files or stop them making copies. Either way, you won't be popular. Lesson 1: Backup In this lesson, you use the Backup And Restore console to schedule a file and folder backup and to create a system repair disk. You learn how to set a schedule for file and folder backup and specify what files and folders you want to back up. You can also use the Backup And Restore console to create an image of a complete volume. However, if you want to schedule System Image backups, you need to use a batch file containing command-line commands, and you will learn how to create a System Image backup from an elevated command prompt. A System Image is a copy of all the files and folders on the system disk (and other specified hard disks) on a computer. You can use a System Image backup to restore the computer to exactly what its configuration was when the System Image backup was created.
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After this lesson you will be able to: Use the Backup And Restore console to schedule a file and folder backup and to perform a System Image backup. Create a system repair disk. Understand the backup file structure and backup sets. Create a System Image backup from an elevated command prompt. Estimated lesson time: 35 minutes
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Scheduling Backups with the Backup and Restore Console Windows 7 Backup uses shadow copies to take a snapshot of your files, allowing the backup to completely back up files even if they are open. Backups are configured and scheduled by using the Backup And Restore console under System And Security in Control Panel. The first time you use the Backup And Restore console when no scheduled backups are configured on your computer it looks similar to Figure 14-1.
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Figure 14-1: The Backup And Restore console when no backups are configured In this case, one of your first tasks should be to configure regular backups by clicking Set Up Backup. You are prompted for a backup destination, as shown in Figure 14-2.
Figure 14-2: Selecting a backup destination You can select the following types of backup destination:
A second internal hard drive Hard drives are secure (especially when formatted using the NTFS system), relatively inexpensive, and typically always available. You can install the drive in another computer if you want to restore backed up data to that computer. However, installing a second hard drive in a computer and switching an internal hard drive to another computer is by no means as straightforward as inserting or unplugging an external device. If your computer has two internal hard drives and you have chosen to implement a dual-boot system with an operating system on both of these drives, you cannot use either of the hard drives as a backup destination for the other. Do not store your backups on a separate partition on a single hard drive on your computer. If you lose the hard drive due to hardware failure or because it needs to be wiped after a virus attack, you also lose your backup.
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