Which of the following archiving methods only backs up data that has changed since the previous backup?

A differential backup copies all data that has changed since the last full backup, not since the previous backup of any type.

A copy backup is a full backup that does not clear the archive bit, meaning it doesn't affect subsequent incremental or differential backups.

An incremental backup only copies data that has changed since the last backup, regardless of whether that last backup was full or incremental. This method typically results in the fastest backup times and smallest backup files.

A snapshot creates a point-in-time image of a system or data, but it is not a backup method that specifically targets only changed data for archiving.