A customer wants to schedule a backup job that compares and saves changes from the last full backup. Which of the following backup types should be used?

A differential backup compares the current data state against the last full backup and captures only the data that has changed since that full backup ran. This means only two sets are needed for a restore - the last full backup and the most recent differential - satisfying the requirement of comparing against the last full backup specifically.

A full backup copies all data regardless of previous backups and does not perform a change comparison against a prior backup.

A clone backup creates an exact sector-level copy or mirror of the entire data source, not a change-based comparison against a prior backup.

An incremental backup saves only changes since the last backup of any type - whether full or incremental - not specifically since the last full backup.