Which backup method copies only files that have changed since the last full backup, but does not clear the archive bit?

Question

Options

• ADifferential backup method.
• BFull backup method.
• CIncremental backup method.
• DTape backup method.

• A
  91% (20)
• B
  5% (1)
• C
  5% (1)

Explanation

A differential backup copies all files that have changed since the last full backup. Critically, it does not reset (clear) the archive bit after backing up a file. This means each successive differential backup grows larger, because it re-copies everything changed since the full backup, not just changes since the last differential. This distinguishes it from the incremental method, which does clear the archive bit and only captures changes since the last backup of any type. The advantage of differential backups is faster restoration - you only need the last full backup and the most recent differential, versus the full backup plus every incremental tape.

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