Ding a backup is a copy of data that is archived and

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(ding) A backup is a copy of data that is archived and which can be used to restore corrupt or lost data in the event of a hardware or system failure. Backups must be performed while the system is in good working order. In other words, you must plan for disasters ahead of time and take the necessary actions to protect your system before there is a problem.
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Backup tools may be used to protect different types of data: System state data includes all of the files required to boot and run the computer. System state data includes the operating system files, the registry, drivers, and any configuration files. User data includes all data files saved and modified by users or applications that users run. The user data is the most important data for a company. Because user data changes constantly, back up the user data frequently and on a regular schedule. Application data includes files installed by an application and application configuration files. Application data changes only following the installation of an application or following a configuration change. Depending on the system you are using, a backup of system state data might include backing up all application files as well. Use the following tools to protect Windows systems: Windows Version Tools Windows 7 On Windows 7 systems, the backup process is managed using the Backup and Restore console in Control Panel. The Backup and Restore console supports two types of backups: A system image backup backs up everything on the system to a .vhd file, including the operating system, installed programs, drivers, and user data files. A system image backup is the most complete type of backup, but also takes the longest time to create. A file backup backs up specific files and folders up to a compressed file. File backups do not include system files, program files, encrypted files, files in the Recycle Bin, user profile settings, or temporary files. The Backup and Restore console leverages the shadow copy feature of the Windows file system to allow files to be backed up even if they are open when the backup runs. The initial backup process backs up all of the files specified in the job. However, subsequent backups will evaluate the state of the file system and only backup files that have changed since the last backup was run. As a result, the first backup will take quite some time to complete, but subsequent backups will run much faster. On Windows 7, backups can be saved to several different types of storage media: Secondary internal hard drives External hard drives Optical drives USB flash drives Network shares Backup files cannot be saved to: The same disk that is being backed up A disk containing the Windows operating system A tape drive System images created with the Backup and Recovery Console cannot be saved to: Flash memory A tape drive A recordable DVD On Windows 7, file backups occur every Sunday at 7:00 pm by default. However, the backup schedule can be customized. A system image backup cannot be scheduled, but a system image backup can be included within a
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