Isaca Certification CISA Book

When storage space is limited,incremental backupsare the most efficient because they store only the changes made since the last backup, reducing storage requirements.

Option A (Correct):Incremental backupsonly store data that has changed since the last backup, significantly reducing storage usage while maintaining a historical record of changes.

Option B (Incorrect):Mirror backupscreate an exact copy of the entire system, consuming significant storage space andnot retaining historical versions.

Option C (Incorrect):Full backupscapture everything and require large amounts of storage, making them impractical for space-constrained environments.

Option D (Incorrect):Annual backupsrefer to frequency rather than method. They do not inherently optimize storage usage.

 Secure coding practices are the best way to prevent cross-site scripting (XSS) attacks, because they can ensure that the web application validates and sanitizes user input and output data to prevent malicious scripts from being executed on the web browser. XSS attacks are a type of web application vulnerability that exploit the lack of input validation or output encoding in webpages that accept user input or display dynamic content. Application firewall policy settings, a three-tier web architecture, and use of common industry frameworks are not effective controlsto prevent XSS attacks, because they do not address the root cause of the vulnerability in the web application code. References: CISA Review Manual (Digital Version), Chapter 5, Section 5.4.2