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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