Going with (B) Incremental. If it was Differential we should see the 102-104 .bak files compound in size.
* Differential backups slow as the week progresses, but have faster restoral times.
Incremental have quicker backup times, but slower restoral times.
B. Incremental
Don't get distracted. The question is not just definitions, it's about your ability to reason.
1. Assume 01012020.bak (100MB) and 01052020.bak (120MB) are full backups due to their size in comparison to other .bak files.
2. 01022020.bak is 10MB followed by 01032020.bak is only 5MB, we can assume that these are incremental backups. If they were differential, 01032020.bak would be 15MB, inclusive of the 5MB from that day, and the 10MB from the day before.
3. file size of the last two .bak files are in ascending order, since Differential backups increase in size daily. This is a distraction. A well planned disaster recovery plan would not do Full/Incremental for one cycle, then follow the next cycle with Full/Differential. You can assume that the last .bak file in the list is simply coincidentally larger than the day prior.
4. Thus, the backup routine appears to be a full backup followed by incremental backups for the next three days.
Incremental would require every incremental backup since a full backup on 0101 so would require 0101, 0102, 0103, 0104, 0105, 0106 assuming the last full backup was 0101. Differential would require only 0106 and 0101 so D is correct
D. Differential
"differential backup" requires another file to restore data. In a differential backup, data that has changed since the last full backup is backed up. To restore the data, you need the last full backup and the most recent differential backup.
So this is tricky assuming the backup on 1/5 is a full backup. That would give you two correct answers (Incremental and Differential). It could be incremental because you need all incremental backups after the last full backup, which was on 1/5. It could also be differential because you need the latest differential and the latest full backup to restore.
I think I may change my answer to incremental since the file size is not getting bigger with each incremental backup. This is probably an incremental backup.
D. Differential
A "differential backup" requires another file to restore data. In a differential backup, data that has changed since the last full backup is backed up. To restore the data, you need the last full backup and the most recent differential backup. This is in contrast to an incremental backup, where you need the last full backup and all the incremental backups since that full backup to restore the data.
Which of the following backup types is being used if the file 01062020.bak requires another file to restore data?
A. Full
B. Incremental
C. Snapshot
D. Differential
The differential backup is the backup type that requires another file to restore data. It requires a full backup and the latest differential backup (or the relevant differential backup for an older recovery point) to recover data
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