Option D is a bit misleading. Differential incremental backups may save space, but the restore process can be longer compared to cumulative incremental backups.
C) If the backup strategy is full backup combined with differential incremental backup, after a system failure, if you want to restore to the most recent data, then It is necessary to restore the data of the last full backup and all differential incremental backups after the full backup.
A) If there are only cumulative incremental backups in the schedule, but no full backups, when performing cumulative incremental backups for the first time, all files will be backed up.
B is the correct answer. A combination of full, differential, and cumulative incremental backups is the recommended approach for a robust backup strategy.
Option A is wrong. If there are only cumulative incremental backups and no full backups, the first cumulative incremental backup will not back up all files, only the changes since the last backup.
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