CompTIA A+ 1102 Managing Backups

Differential Backup

subsequent backups contain data changed since the last full backup

Incremental Backup

- subsequent backups contain data changed since the last full backup and the last incremental backup
- a restoration requires the last full backup and all of the incremental backups

Synthetic Backup

- the first full backup copies every file
- subsequent full backups are created from previous backups

On Site Backups

- no internet link required
- data is immediately available
- generally cheaper than off site backups

Off Site Backups

- requires a WAN or internet link
- data is available after a disaster
- restoration can be performed from anywhere

Grandfather-Father-Son (acronym)

GFS

Grandfather-Father-Son

- three separate backup rotations
- monthly, weekly, and daily

3-2-1 Backup Rule

- 3 copies of data should always be available
- 2 different types of media should be used
- 1 copy of the backup should be off site