Which of the following backup methodologies is MOST time efficient for backing up data?

Incremental backups only save data that has changed since the last full or incremental backup, resulting in the smallest backup size and the fastest backup time because only a minimal amount of new or modified data needs to be copied.

Snapshots capture a system's state at a point in time and are used for quick recovery, but they are not a backup methodology in the same sense as incremental, differential, or full backups.

Differential backups save all data that has changed since the last full backup; this can grow quite large and take longer than an incremental backup, as it includes all accumulated changes.

GFS (Grandfather-Father-Son) is a backup rotation scheme that defines when and how often backups are taken and retained, rather than a specific methodology dictating what data is backed up.