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Backup Types |
  
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Backup Types |
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Windows files have an attribute called an Archive Bit (flag). This is a Flag that can be toggled on or off to indicate whether the files has been archived (backed up).
By default, anytime you save a file, its archive flag gets set to off. This indicates that the file does not have a currently archived copy somewhere.
Most backup programs are designed to set the archive flag to on after they have successfully backed the file up. The significance of the archive flag comes into play when you want a program to only backup files that have changed.
Backup operations are configured into groups called sets. A backup set can be configured to backup certain files on a scheduled basis.
For example a daily set can be created to backup only the document files that have changed since the last backup.
A weekly set can be created to backup all the data files, even if they have not changes since the last time a backup set has run.
A monthly set can be created to backup all the files, not just the document files.
Full Backup refers to backing up all of the files in a backup set regardless of the status of their archive bit.
Typically the archive flag is turned on after a successful backup is made. This allows the other backup type to only backup changed files.
Incremental Backups typically backup all the file that have their archive flag turned off (files that have changed).
Incremental Backups DO set the archive bit to on after the files is successfully backed up.
Differential Backups typically backup all the file that have their archive flag turned off (files that have changed).
Differential Backups do NOT set the archive bit to on.
The main purpose of this type of backup is that it will allow another backup set (or program) to backup the same files.
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Page url:
http://www.tje.net/PCSupport/index.html?backuptypes.htm
Page content was last updated: 4/22/2009
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