Managing backups

Question 1

Incremental backup

Answer 1

• A full backup is taken first
• Subsequent backups contain
  data changed since the last full
  backup and last incremental backup
  – These are usually smaller
  than the full backup
• A restoration requires the full backup
  and all of the incremental backups

Question 2

Differential backup

Answer 2

• A full backup is taken first
  – Subsequent backups contain data
  changed since the last full backup
  – These usually grow larger as
  data is changed
• A restoration requires the full backup
  and the last differential backup