Which of the following backup methodologies would BEST be used to provide an instant copy of the current data within the same disk group?

A snapshot creates a point-in-time logical copy of data by saving changes made after the snapshot, effectively providing an instant, space-efficient 'virtual copy' using pointers to the original data blocks within the same disk group. This allows for quick restoration to the snapshot's state.

A clone creates a full, independent physical copy of the data, which is not 'instant' and typically consumes as much space as the original, making it less efficient for a quick 'instant copy' within the same disk group.

An incremental backup saves only the data that has changed since the last backup (of any type), which is a backup strategy and not an 'instant copy' mechanism for data within the same disk group.

A differential backup saves all data that has changed since the last full backup, which is also a backup strategy and not an 'instant copy' mechanism for data within the same disk group.