Backuparchivebit 090710170914-phpapp01

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Archive BIT

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Backuparchivebit 090710170914-phpapp01

  1. 1. Backup Archive Bit<br />
  2. 2. Backup refers to making copies of data so that these additional copies may be used to restore the original after a data loss event. <br />Backup Data<br />
  3. 3. But how does the backup utility knows which files to backup??!!<br />
  4. 4. One of the files properties is <br />The Archive Bit.<br />The archive bit is a binary bit.<br />Either 1 or 0, it is also called set (1) and clear or reset (0).<br />Backup Archive Bit<br />
  5. 5. What does this bit represents?!<br />If it has been set to (0) it represents that the file has been backed up.<br />And (1) represents that the file has been modified since the last backup.<br />
  6. 6. How does it work?!<br />When the backup operation is done, it looks for files with the (1) archive bit.<br />Once the file is backed up, <br /> it will be reset to (0).<br />This type of backup is called.. <br /> An incremental backup.<br />
  7. 7. Backup Methods<br />These backup methods can affect the archive bit:<br /><ul><li>Full Backup : reset archive bit
  8. 8. Differential Backup : does not reset archive bit
  9. 9. Incremental Backup : reset archive bit</li></li></ul><li>Attrib Command<br />The archive bit can be seen or changed with the attribcommand-line utility.<br />
  10. 10. Syntax:ATTRIB [d:][path]filename [/S]ATTRIB [+ R|-R] [+A|-A] [+ H|-H] [+ S|-S] [d:][path]filename [/S]<br />

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