Which backup type is small and saves time?

A.
Full backups.

B.
Incremental backups.

C.
Both of the above.

D.
None of the above.

Explanation:
While full backups are used to back up all business data and applications that have been identified for backing up, incremental backups are performed to back up data that have changed since the backup was performed. Being smaller than full backups, incremental backups tend to reduce tape utilization and it also saves time.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 379.