Mastering Incremental Backups: The Smart Choice for Data Management

What type of backup copies only the files that have been modified since the last backup?

• A. Full Backup
• B. Incremental Backup
• C. Differential Backup
• D. Mirror Backup

Answer: (B)

Incremental backups specifically focus on capturing only the files that have changed since the last backup of any type, whether that was a full backup or another incremental one. This method is efficient because it saves storage space and reduces the time required to perform the backup compared to full backups that capture all data every time. In a backup strategy, when an incremental backup is performed, it records only the differences, or modifications, leading to a sequence where each subsequent backup reflects only new changes. This contrasts with the other types of backups listed. For instance, a full backup saves everything regardless of changes, a differential backup saves all changes since the last full backup, and a mirror backup creates a direct replica of the files, without historical versions. Thus, the choice of incremental backup is optimal for scenarios where minimizing storage and time is crucial while maintaining up-to-date records of data alterations.

When it comes to managing data, using the right kind of backup can make all the difference—especially in the context of preparing for the Certified Information Systems Security Professional (CISSP) exam. So, what type of backup only captures the files that have been modified since the last backup? If you guessed Incremental Backup, you’re spot on! This method is all about efficiency, but let’s dig a little deeper, shall we?

Incremental backups are designed to record only the changes made since the last backup, whether that last one was a full backup or another incremental one. It's like tidying up your room—if you do a full clean (a full backup), you get everything in its place. But after that, you might only need to pick up the few items that have been moved or misplaced since then (which is essentially what an incremental backup does). This not only saves storage space but also cuts down on the time it takes to perform these backups compared to doing a full backup every single time. So, it’s a win-win!

Here's where the other backup types come into play. Full backups—those are the heavy lifting of the backup world. They save all your data in one go, but let’s be honest, they can be quite time-consuming and storage-intensive. On the flip side, we have differential backups that capture all changes made since the last full backup. This may seem more efficient than doing full backups regularly, but still, it can take longer than incremental ones. Then there's the mirror backup, which is like looking into a mirror—whatever is present at that moment gets copied over, but with no historical versions saved.

As you can see, knowing the differences between these various types is pivotal for data strategy—especially when prepping for something as demanding as the CISSP exam. Why? Because these concepts not only muddle through the questions on the exam but form the bedrock of robust data management strategies.

To further highlight the brilliance of incremental backups, consider a real-world application: Suppose you’re working with a big team on a software project that sees multiple updates daily. If you used full backups, you'd constantly be duplicating efforts, and you’d quickly find that your server’s storage capacity is nearing its limits. With incremental backups, however, everyone can focus on the updates since the last backup, fostering a more collaborative and less frustrating work environment. You know what? This streamlined approach is the backbone of so many successful businesses.

If you're gearing up for the CISSP exam, don’t just memorize these definitions. Think about how each type of backup fits into scenarios you might encounter in your professional life. Understanding these principles will not only help you ace the test but also prepare you for real-world application.

So, as you study, keep these distinctions in mind, and ask yourself—how would each backup type serve in different situations? It's this kind of critical thinking that'll truly set you apart. Plus, when you nail that exam, you'll have the confidence to implement these strategies effectively in your career.