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SYLLABUS (updated 2022)

Archiving of data and types of backup techniques; full, differential, incremental and daily 12ATAR

PURPOSE

  • It is a wise person or company who plans backups and then archives important data.
  • Why would someone do this?
  • Why would a company do this?
  • If you place importance on your digital creations, you will have back up copies.
  • Companies use software to do the following types of backups.

 

FULL BACKUP

  • is a duplicate of your existing data storage system
  • it contains the same folders and the same files
  • it also takes up the same amount of space (unless compressed)
  • Advantage is you can restore your data from one location
  • Disadvantage is it is slow and takes up lots of space

 

DIFFERENTIAL BACKUP

  • the backup software looks at the files that have changed since the last full backup, it backs up the files that are different
  • you will have one full backup and several differential backups.
  • to restore, use your full backup and the last differential backup
  • advantage is not as much storage space needed as another full back, also much quicker than another full backup
  • disadvantage is differential backup is slower than incremental because it is always looking back at the last full backup

INCREMENTAL BACKUP

  • backs up only files that have been added or modified since the last  backup of any type
  • incremental means if you back up each day then only the files changed on each day are backed up
  • to restore use the full back up, then also use the incremental backups of each day
  • advantage is incremental backups are quick
  • disadvantage is it takes the most time to restore from the many backups taken

 ARCHIVE

  • is a copy of files that are not needed on a daily basis
  • they are put onto a different location away from the main file storage system
  • if they are needed, then they can be retrieved from the external storage system and used again.
  • advantage is it frees up space on the normal storage location for daily use
  • disadvantage is if you need a file, you may need to wait to get it from the archive location

 

 
 
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