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Disaster recovery plan feature: restoration

The ordered process of bringing systems and data back into use from backups after a disruption, restoring critical systems first and then checking the restored data is correct and complete.

Part of: VCE Data Analytics - U4O2 - Cyber Security: Data Security — Module 88

Understanding Disaster recovery plan feature: restoration in VCE Data Analytics U4O2

What it does: The list puts the systems the business cannot operate without at the start, showing restoring critical systems first. Verifying restored data against a known good value, such as a hash or record count, confirms nothing is missing or corrupted. Restoration moves data from backups back into use. Making the backup copy is a different step, called backing up. RTO is about time to recover. How much data loss is acceptable is the recovery point objective (RPO). A finished restore does not prove the data is right. Comparing counts and hashes checks that it is complete and unchanged. The recovery time sets how quickly restoration must finish, which helps decide which systems are restored first.

Common mistakes: Restoration is not finished when the data is copied back. The restored data must be verified to confirm it is correct and complete. Line 3 should be '3. Verify restored data'. The recovery time objective (RTO) is how long the organisation can take to restore systems. How much data can be lost is the recovery point objective (RPO). Line 4 should say RTO is time allowed to restore.

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This module's key terms are also in a printable crossword (Modules 80–113) and word search (Modules 44–113).

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Learning

Duo

In a disaster recovery plan, which should be restored first after a disruption?

Whichever systems are quickest to restoreCritical systems that the business cannot operate without

Matches

RPO = 24 hours (backups taken every 15 minutes)

↓

Recovery point objective is mixed up with backup frequency. The RPO is the maximum data loss allowed, so frequent backups mean a small RPO, such as 15 minutes, not 24 hours.

Applying

Meanings

Term

restoration

Meaning

The ordered process of bringing systems and data back into use from backups after a disruption, restoring critical systems first and then checking the restored data is correct and complete.

Practice

RESTORE critical systems first

Testing

Gaps

payrollDB FROM latestBackup

Check Answer

Spots

22. Restore email server

33. Skip checking restored data

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Quick Questions

1. In a disaster recovery plan, which should be restored first after a disruption?

A. Whichever systems are quickest to restore

B. Critical systems that the business cannot operate without ✓

Restoration is ordered. Critical systems, such as the payment system, come first so core operations resume sooner.

2. Which statement describes restoration correctly?

A. Bringing systems and data back into use from backups ✓

B. Copying live data onto a new backup drive

Restoration moves data from backups back into use. Making the backup copy is a different step, called backing up.

3. What does the recovery time objective (RTO) measure?

A. How quickly a system must be restored after a disruption ✓

B. How much recent data can be lost

RTO is about time to recover. How much data loss is acceptable is the recovery point objective (RPO).

4. A business backs up nightly at 11 pm and fails at 3 pm the next day. What is the recovery point?

A. 11 pm, the time of the last backup ✓

B. 3 pm, the time of the failure

The recovery point is the last good backup. Data entered between 11 pm and 3 pm is lost unless it can be recovered another way.

5. Which backup schedule gives a smaller recovery point (less data loss)?

A. Backing up once a week

B. Backing up every hour ✓

More frequent backups mean the last backup is closer to the failure, so less data is lost.

Match the Pairs

restoration → The ordered process of bringing systems and data back into use from backups after a disruption

RTO = 4 hours → Recovery time objective: the longest acceptable time to get a system working again after a disruption

Restore the most critical systems first, then less important ones → restore_order = ["payment system", "customer database", "staff intranet"]

Check the restored data is correct and complete before returning to normal use → verify(restored_data, backup_checksum)

RPO = 24 hours (backups taken every 15 minutes) → Recovery point objective is mixed up with backup frequency. The RPO is the maximum data loss allowed, so frequent backups mean a small RPO, such as 15 minutes, not 24 hours.

restore(all_systems); verify(); restore(payment_system) → The critical payment system is restored last and verification happens too early. Critical systems should be restored first and data checked after restoring.

Key Term

restoration

The ordered process of bringing systems and data back into use from backups after a disruption, restoring critical systems first and then checking the restored data is correct and complete.

Fill in the Blanks

1. RESTORE payrollDB FROM latestBackup

Hint: Type the keyword that brings data back into use from a backup.

2. RESTORE critical systems FIRST RESTORE other systems NEXT VERIFY restored data

Hint: Type the word describing which systems are restored before all the others.

3. IF restoreHours <= RTO THEN PRINT "Within recovery time" END IF

Hint: Type the abbreviation for the maximum acceptable time to get systems running again.

4. IF hoursSinceBackup <= RPO THEN PRINT "Data loss acceptable" END IF

Hint: Type the abbreviation for the maximum acceptable amount of data loss, measured in time since the last backup.

5. IF HASH(restoredData) = backupHash THEN PRINT "Restored data verified" END IF

Hint: Type the comparison operator that checks the restored data matches the backup.

Spot the Error

Question 1

A 1. Restore payroll database

B 2. Restore email server

C 3. Skip checking restored data

Line C — Restoration is not finished when the data is copied back. The restored data must be verified to confirm it is correct and complete. Line 3 should be '3. Verify restored data'.

Question 2

A RTO = 2 hours

B RPO = 1 hour

C Backup runs every hour

D RTO is how much data we lose

Line D — The recovery time objective (RTO) is how long the organisation can take to restore systems. How much data can be lost is the recovery point objective (RPO). Line 4 should say RTO is time allowed to restore.

Question 3

A Tier 1: payments, customer DB

B Tier 2: email, intranet

C Restore Tier 2 first

Line C — Critical systems (Tier 1) must be restored first so the business can operate again. Less important systems such as email and the intranet come later. Line 3 should be 'Restore Tier 1 first'.

Question 4

A RESTORE orders FROM backup

B hash = HASH(orders)

C IF hash != saved_hash: PASS

Line C — A restored file passes verification only when its hash matches the saved hash taken before the disruption. A mismatch means the data changed or is corrupt. Line 3 should use = not !=.

Question 5

A 1. Assess damage

B 2. Restore Tier 1 systems

C 3. Restore Tier 2 systems

D 4. Reopen, then verify data

Line D — Restored data must be verified before users rely on it. Reopening first risks people using incorrect or incomplete data. Line 4 should be '4. Verify data, then reopen'.

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