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08.17.06
Backup/Restoration Of Files For Disaster Recovery
 By
Team uCertify
Planning a backup and restoration of files is the most important step to protect
data from accidental loss in the event of data deletion or a hard disk failure.
The backup copy can be used to restore lost or damaged data. For taking backups and restoring files, Microsoft has provided a utility called Backup. The Backup utility creates a copy of data on a hard disk of a computer and archives data on another storage media. Any storage media such as removable disks, tapes, and logical drives can be used as a backup storage.
While taking a backup of files, the Backup utility creates a volume shadow copy of the data to create an accurate copy of the contents. It includes any open files or files that are being used by the system. Users can continue to access the system while the Backup utility is running without the risk of losing data.
Volume Shadow Copy
Backup provides a feature of taking a backup of files that are opened by a user or system. This feature is known as volume shadow copy. Volume shadow copy makes a duplicate copy of all files at the start of the backup process. In this way, files that have changed during the backup process are copied correctly. Due to this feature, applications can continue writing data to the volume during a backup operation, and backups can be scheduled at any time without locking out users.
Types of Backups
The Windows Backup utility provides various types of backups. While planning for a backup strategy, it is important to choose an appropriate type or combination of different types of backups. The backup type determines which files are transferred to the destination media.
Each backup type relates to an attribute maintained by every file known as archive (A). The archive attribute is set when a file is created or changed. When an archive attribute is set, it means that the backup of this file has not been taken or it is due.
Note: When it is said that "The file is marked as backup", it means that the archive attribute of the file has been cleared.
Normal Backups
When an administrator chooses to use a normal backup, all selected files and folders are backed up and the archive attribute of all files are cleared. A normal backup does not use the archive attribute to determine which files to back up. A normal backup is used as the first step of any backup plan. It is used with the combination of other backup types for planning a backup strategy of an organization. Normal backups are the most time-consuming and are resource hungry. Restoration from a normal backup is more efficient than other types of backups.
Incremental Backups
An incremental backup backs up files that are created or changed since the last normal or incremental backup. It takes the backup of files of which the archive attribute is set. After taking a backup, it clears the archive attribute of files. An incremental backup is the fastest backup process. Restoring data from an incremental backup requires the last normal backup and all subsequent incremental backups. Incremental backups must be restored in the same order as they were created.
Note: If any media in the incremental backup set is damaged or data becomes corrupt, the data backed up after corruption cannot be restored.
Differential Backups
Differential backup backs up files that are created or changed since the last normal backup. It does not clear the archive attribute of files after taking a backup. The restoration of files from a differential backup is more efficient than an incremental backup.
Copy Backups
A copy backup copies all selected files and folders. It neither uses nor clears the archive attribute of the files. It is generally not a part of a planned scheduled backup.
Daily Backups
A daily backup backs up all selected files and folders that have changed during
the day. It backs up data by using the modified date of the files. It neither
uses nor clears the archive attribute of the files.
Read
the Full Article
About the Author:
uCertify was formed in 1996 with an aim
to offer high quality educational training software and services in the field
of information technology to its customers. uCertify provides exam preparation
solutions for the certification exams of Microsoft, CIW, CompTIA, Oracle, Sun
and other leading IT vendors. |
