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Table Of Contents  CertiGuide to Security+
 9  Chapter 5:  Operational/Organizational Security (Domain 5.0; 15%)
      9  5.2  Disaster Recovery
           9  5.2.1  Backups

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Types of Backups

All backups are not created equal. The following is a description of the types of backups you can do, and how to restore them.

Full Backup

This choice means:

Everything selected is fully backed up. The entire drive will be recoverable in the event of a failure. Be sure all the hidden files are checked. Typically this is done weekly. The archive bit for each file is then reset to “OFF”.

This method is the slowest, but most complete and reliable backup possible. To restore from a full backup set simply use the full set (complete) of tapes or other media and begin the restoration process.

Differential Backup

This choice means:

All files that have changed since the last full (complete) backup are saved in this backup method. Typically, this is done every day, concluding with a full backup of the week (separate process) and then when the next week starts, the cycle (schedule) of backups of all files that have changed since this most recent full backup begins again. The maximum number of backup sessions that occur in a week for this method is five, assuming that users work on the system five days a week. The archive bit for each file is not touched (reset) during each backup.

This method is slower than, but not as slow as, a full backup. This method is safer than an incremental backup, but not as easy as a full backup, to restore. When you need to restore you must use a full set (all of them!) of the full (complete) backup tapes, and the most current differential backup tape.

Incremental Backup

This choice means:

A partial backup of files that have changed, since the last full or incremental backup. Typically, this method is used as a daily backup. This means that only the files that have changed are backed up each day and since the amount of data or information is less, it is a faster method. The each file’s archive bit is cleared to “OFF” each backup.

To restore from tape using this backup method, you must use the full backup (complete) set of tapes AND each daily tape, going all the way back to the last full backup.


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