When the backup window is not long enough to backup all of the data and the restoration of backup must be as fast as possible. Which of the following type of high-availability backup strategy is recommended?

A.
Full

B.
Incremental

C.
Differential

D.
Increase the backup window so a full backup can be performed

Explanation:
C: Full backup would not be possible since the backup window is not long ago for all the data to be backed up. Additionally, it is less likely that the backup window can be increased to allow for a full backup, which is both time consuming and costly from a storage perspective. In an incremental backup, only the files that changed since the last backup will be backed up. In a differential backup, only the files that changed since the last full backup will be backed up. In general, differentials require more space than incremental backups while incremental backups are faster to perform. On the other hand, restoring data from incremental backups requires more time than differential backups. To restore from incremental backups, the last full backup and all of the incremental backups performed are combined. In contrast, restoring from a differential backup requires only the lastfull backup and the latest diff erential. Page 549.