Exam 220-1102 topic 1 question 184 discussion

Incremental all day long

An incremental backup approach is used when the amount of data that has to be protected is too voluminous to do a full backup of that data every day. By only backing up changed data, incremental backups save restore time and disk space. Incremental is a common method for cloud backup as it tends to use fewer resources.

The question explicitly states the customer isn't worried about "Speed." and Mirror Backup is the fastest backup version among those listed. And from what I know, it only keeps an exact copy of the data, not multiple copies. So despite the supposed "correct" answer being "B", I disagree. Incremental Backups are the most frequent among the options listed. The correct answer is likely: C. Incremental

d. A differential backup only backs up the changes made since the last full backup, which means that it takes up less storage space than a full backup

In a RAID 1 system, you can configure as many drives as you want to mirror a single drive, creating constant redundancy of that data.

The law firm is not concerned with restore times(incremental is complex due to the number of jobs) but asks the technician to retain more versions when possible(incremental provides more versions of a copy). Increment begins with a full backup and only runs jobs that pick files that have been added or changed since the last position. The shortest time and storage requirements are for incremental jobs. Although this kind of chain might comprise two or more jobs, each of which may be saved on a different medium, it has the most complicated recovery process.

Incremental backups only back up the data that has changed since the last backup, which can result in smaller backup sizes and faster backups. Additionally, retaining multiple versions of incremental backups can allow for greater backup history while using less storage space than multiple full backups.