quizzes: expand all 35 quizzes to 15 questions each

OPS-1 through OPS-10, OS-2, OS-3 went from 5 → 15.
OS-1, OS-4 through OS-11, SEC-1 through SEC-11, TRB-1 through TRB-4 went from 7 → 15.
Questions cover exam-weight scenarios not duplicated from original content.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

quizzes/OPS-3-quiz.md

@@ -42,6 +42,76 @@ B. Incremental
 C. Differential  
 D. Manual only  
 
+6. A company backs up all data every Sunday (full) and changed files every other day. Which type are the daily backups?
+
+A. Full  
+B. Synthetic  
+C. Differential  
+D. Incremental  
+
+7. Which backup strategy provides the fastest restore time but uses the most storage?
+
+A. Incremental only  
+B. Full backup each time  
+C. Differential chain  
+D. GFS  
+
+8. What does GFS (Grandfather-Father-Son) backup rotation describe?
+
+A. A three-level hierarchy of daily, weekly, and monthly backups  
+B. A RAID configuration  
+C. A printer maintenance schedule  
+D. A driver signing policy  
+
+9. Which backup media type is most commonly used for long-term archival due to low cost per GB?
+
+A. SSD  
+B. USB flash drive  
+C. Tape  
+D. RAM module  
+
+10. A technician restores files from last night's backup, but the restored files are corrupted. What was missing from the backup strategy?
+
+A. A second monitor  
+B. Regular restore testing  
+C. An SSID  
+D. A change freeze  
+
+11. What is the key difference between a backup and a snapshot?
+
+A. They are identical in every way  
+B. A snapshot captures system state at a point in time; a backup copies data to separate storage  
+C. Backups are always faster than snapshots  
+D. Snapshots replace the need for a 3-2-1 strategy  
+
+12. A file server is restored from backup, but users report data missing from yesterday. What is the likely cause?
+
+A. The EULA expired  
+B. The backup did not run yesterday or did not include all folders  
+C. The SLA was updated  
+D. Asset tags were removed  
+
+13. Why is offsite backup storage important?
+
+A. It reduces the need for asset tags  
+B. It protects data if the primary location is damaged or destroyed  
+C. It speeds up incremental backups  
+D. It disables the GFS rotation  
+
+14. A restore requires last week's full backup plus differential backups. How many sets are needed?
+
+A. Just the full backup  
+B. The full backup plus all differential sets  
+C. The full backup plus only the most recent differential  
+D. Only the last differential set  
+
+15. Which cloud backup benefit is most relevant to a small business with no dedicated IT staff?
+
+A. Higher power consumption  
+B. Reduced need to manage physical media and offsite transport  
+C. Longer restore times  
+D. Higher licensing costs  
+
 ## Answer Key For Instructor
 
 1. B
@@ -49,3 +119,13 @@ D. Manual only
 3. A
 4. D
 5. B
+6. D
+7. B
+8. A
+9. C
+10. B
+11. B
+12. B
+13. B
+14. C
+15. B