Disaster recovery planning in SCADA systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is disaster recovery planning in SCADA systems?

Disaster recovery planning is the process of preparing steps to restore SCADA systems quickly after a failure or disaster to keep operations running safely.

beginner

Name two common types of disasters that disaster recovery plans address in SCADA systems.

Natural disasters like floods or earthquakes, and technical failures like hardware breakdowns or cyberattacks.

beginner

Why is regular backup important in disaster recovery planning?

Regular backups save copies of important SCADA data and configurations so they can be restored quickly after a disaster.

intermediate

What role does testing play in disaster recovery planning?

Testing checks if the disaster recovery plan works well and helps find problems before a real disaster happens.

intermediate

Explain the difference between disaster recovery and business continuity.

Disaster recovery focuses on restoring SCADA systems after a disaster, while business continuity ensures all operations keep running during and after the disaster.

What is the first step in disaster recovery planning for SCADA systems?

A Wait for a disaster

B Identify critical systems and data

C Ignore backups

D Buy new hardware

The first step is to identify which systems and data are critical to recover quickly.

Which of these is NOT typically part of a disaster recovery plan?

A Regular data backups

B Communication plans

C System restoration procedures

D Employee vacation schedules

Employee vacation schedules are not part of disaster recovery plans.

How often should disaster recovery plans be tested?

A Regularly, such as yearly or after changes

B Never

C Only once when created

D Only after a disaster

Regular testing ensures the plan works and stays up to date.

What is the main goal of disaster recovery in SCADA systems?

A To restore system operations quickly after a failure

B To prevent all disasters from happening

C To replace all hardware annually

D To shut down the system permanently

Disaster recovery aims to restore operations quickly after problems.

Which disaster recovery component helps communicate during a crisis?

A System logs

B Backup hardware

C Communication plan

D User manuals

A communication plan ensures clear messages during emergencies.

Describe the key steps involved in creating a disaster recovery plan for SCADA systems.

Think about what you need to protect and how to recover it.

Explain why disaster recovery planning is essential for SCADA systems in industrial environments.

Consider the impact of system failures on safety and business.

Practice

1. What is the main purpose of disaster recovery planning in SCADA systems?

easy

A. To improve the system's daily performance

B. To add new features to the SCADA system

C. To prepare the system to recover quickly after an emergency

D. To reduce the cost of hardware components

Solution

1. Step 1: Understand disaster recovery planning

   Disaster recovery planning focuses on preparing for emergencies and restoring system operations quickly.

2. Step 2: Identify the main goal in SCADA context

   The goal is to recover the SCADA system fast after failures or disasters to avoid downtime.

3. Final Answer:

   To prepare the system to recover quickly after an emergency -> Option C

4. Quick Check:

   Disaster recovery = fast system recovery [OK]

Hint: Disaster recovery means quick system recovery after emergencies [OK]

Common Mistakes:

• Confusing disaster recovery with performance improvement
• Thinking it adds new features
• Assuming it reduces hardware costs

2. Which of the following is the correct syntax to schedule a daily backup using a cron job on a Linux SCADA server?

easy

A. 0 24 * * * /usr/local/bin/scada_backup.sh

B. 0 0 * * * /usr/local/bin/scada_backup.sh

C. * * 0 0 * /usr/local/bin/scada_backup.sh

D. 0 0 0 * * /usr/local/bin/scada_backup.sh

Solution

1. Step 1: Understand cron syntax for daily tasks

   The format is 'minute hour day month weekday'. For daily at midnight, use '0 0 * * *'.

2. Step 2: Match the correct cron expression

   0 0 * * * /usr/local/bin/scada_backup.sh uses '0 0 * * *' which means daily at 00:00 hours, running the backup script.

3. Final Answer:

   0 0 * * * /usr/local/bin/scada_backup.sh -> Option B

4. Quick Check:

   Daily midnight cron = 0 0 * * * [OK]

Hint: Cron daily at midnight is always '0 0 * * *' [OK]

Common Mistakes:

• Using invalid hour values like 24
• Mixing up the order of cron fields
• Using zero in wrong positions

3. Given this backup script snippet for SCADA data:

if [ -f /backup/scada_data.tar.gz ]; then
  rm /backup/scada_data.tar.gz
fi
tar -czf /backup/scada_data.tar.gz /var/scada/data

What will be the output or effect after running this script?

medium

A. The old backup file is deleted and a new compressed backup is created

B. The script will fail because of syntax errors

C. The backup file will be duplicated without deletion

D. Nothing happens because the script does not run any commands

Solution

1. Step 1: Analyze the script logic

   The script checks if the backup file exists, deletes it if yes, then creates a new compressed backup.

2. Step 2: Understand the commands' effect

   Removing the old file avoids duplication, and tar creates a new compressed archive of SCADA data.

3. Final Answer:

   The old backup file is deleted and a new compressed backup is created -> Option A

4. Quick Check:

   Old backup removed + new backup created = The old backup file is deleted and a new compressed backup is created [OK]

Hint: Check if file exists, remove it, then create new backup [OK]

Common Mistakes:

• Assuming the script duplicates backups
• Thinking the script has syntax errors
• Ignoring the file existence check

4. A SCADA disaster recovery plan script fails to restore data because the backup file path is incorrect. Which fix will solve this issue?

medium

A. Update the script to use the correct backup file path

B. Increase the server's CPU speed

C. Change the backup file format to .zip

D. Disable the firewall on the SCADA server

Solution

1. Step 1: Identify the cause of failure

   The script fails because it looks for a backup file in the wrong location.

2. Step 2: Apply the correct fix

   Changing the script to point to the correct backup file path will allow it to find and restore the data.

3. Final Answer:

   Update the script to use the correct backup file path -> Option A

4. Quick Check:

   Correct path fix = successful restore [OK]

Hint: Fix file path errors to restore backups correctly [OK]

Common Mistakes:

• Trying unrelated hardware fixes
• Changing file format without reason
• Disabling firewall unnecessarily

5. You need to design a disaster recovery plan for a SCADA system that ensures minimal downtime and data loss. Which combination of strategies is best?

hard

A. Relying solely on hardware redundancy without backups

B. Manual backups once a month and no testing

C. Only offsite storage without backups or testing

D. Regular automated backups, offsite storage, and periodic recovery drills

Solution

1. Step 1: Identify key disaster recovery needs

   Minimizing downtime and data loss requires frequent backups, safe storage, and testing the recovery process.

2. Step 2: Evaluate each strategy

   Regular automated backups, offsite storage, and periodic recovery drills combines automated backups (fast recovery), offsite storage (protection from local disasters), and drills (ensures plan works).

3. Final Answer:

   Regular automated backups, offsite storage, and periodic recovery drills -> Option D

4. Quick Check:

   Backup + offsite + testing = best recovery plan [OK]

Hint: Combine backups, offsite storage, and testing for best recovery [OK]

Common Mistakes:

• Skipping testing of recovery plans
• Relying only on hardware redundancy
• Doing backups too infrequently