An incremental backup consists of creating one full backup followed by a chain of incremental copies that contain information about how the data has changed since the last copy.
The huge advantage of this type of backup is increased speed of backup performance - it will be noticed especially with large files that do not change often and much. Moreover, it is more efficient when it comes to storage - incremental backups definitely less storage space. Finally, it consumes less time.
However, there is one disadvantage of incremental backup - it makes restoration more difficult comparing to restoring only full copy because it means restoring both the last incremental backup and the last full backup as well.