What backup type would generally provide the fastest backup times

What backup type would generally provide the fastest backup times

• Incremental
• Full
• Differential
• Archival 

EXPLANATION

 Full backups copy all sectors of the file image whether the sectors contain data or not. This is easy to operate; however, it is time-consuming, space-intensive, and the least flexible method.

An incremental backup is one in which successive copies of the data contain only that portion that has changed since the preceding backup copy was made. When a full recovery is needed, the restoration process would need the last full backup plus all the incremental backups until the point of restoration. Incremental backups are often desirable as they reduce storage space usage, and are quicker to perform than differential backups.

 A differential backup is a type of data backup that preserves data, saving only the difference in the data since the last full backup.

 Archival backup is a type of data backup in which all files are copied to a backup storage device. Archival backups are also called full backup.Contrast with incremental backups, in which only modified files are copied.