Which Backup Method is Best for Critical Time and Limited Tape Space?

A.

Full Backup/Archival Backup - Complete/Full backup of every selected file on the system regardless of whether it has been backup recently.

This is the slowest of the backup methods since it backups all the data.

Its however the fastest for restoring data.

Incremental Backup - Any backup in which only the files that have been modified since last full back up are backed up.

The archive attribute should be updated while backing up only modified files, which indicates that the file has been backed up.

This is the fastest of the backup methods, but the slowest of the restore methods.

Differential Backup - The backup of all data files that have been modified since the last incremental backup or archival/full backup.

Uses the archive bit to determine what files have changed since last incremental backup or full backup.

The files grows each day until the next full backup is performed clearing the archive attributes.

This enables the user to restore all files changed since the last full backup in one pass.

This is a more neutral method of backing up data since its not faster nor slower than the other two Easy Way To Remember each of the backup type properties: Backup SpeedRestore Speed - Full31 - Differential22 - Incremental13 - Legend:1 = Fastest 2 = Faster3 = Slowest Source: KRUTZ, Ronald L.

& VINES, Russel.

D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 69

and http://www.proprofs.com/mwiki/index.php/Full_Backup,_Incremental_%26_Differential_Backup.

When backup time is critical and tape space is at an extreme premium, the most appropriate backup method to use is the incremental backup method (Option A).

The incremental backup method is a type of backup strategy that only backs up the data that has changed since the last backup was performed. It means that it backs up only the files and folders that have been created, modified or deleted since the last backup. This method is very efficient since it requires less storage space and time to backup compared to other backup methods like full backup or differential backup.

In contrast, the differential backup method (Option B) is a backup strategy that backs up all the changes made since the last full backup. This method is slower and requires more storage space than the incremental backup method.

The full backup method (Option C) is a backup strategy that backs up all the data on a particular system or storage device. This method is time-consuming and requires a lot of storage space. It is typically used for the initial backup or when a significant system upgrade or change occurs.

The tape backup method (Option D) is not a backup strategy, but a backup medium. Tape backup refers to the use of magnetic tape to store backup data. Tape backups can be performed using any of the backup methods mentioned above, depending on the specific backup needs.

In conclusion, the incremental backup method is the most appropriate backup method to use when backup time is critical and tape space is at an extreme premium.