Part 08 – Backups

This section concerns data backups, which is an extremely important issue and one that should hit close to home if you've ever experienced a hard drive or computer failure in your own life. It's even more vital for a large organization with many moving parts. Backups concern redundancy for data in the event of a hardware failure. You need to get the data back! In this section, we cover the main types of backups, the behavior of the file archive bit for each, as well as the trade offs regarding speed cost of backing up versus restoring.
  • Full backup - everything is backed up on a regular schedule regardless if anything has changed. The archive bit is reset upon each backup.
  • Incremental backup - everything that has changed since the last full backup is backed up. The archive bit is reset.
  • Differential backup - all files that have been modified since the last full backup are backed up. The archive bit is not reset.
  • Copy backup - same as a full backup but archive bit is not reset. This form is typically used for unscheduled backups and is used to prevent interfering with the regularly-scheduled daily backups.
We conclude the section by examining the time expense incurred for each type of backup. A full backup is the quickest to restore with incremental being the slowest. The differences between each type of backup are subtle and may require reviewing a few times. It's important to understand the differences for the exam, especially how the archive bit is treated for each type.  
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