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Computer science · lesson 3 of 4

Data protection and backups

Transforming data with a key so unauthorized readers cannot interpret it.

University8 practice questionsNotes + worked examples
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Learn the ideas

Prerequisites: Basic computer and internet literacy.

Encryption

Transforming data with a key so unauthorized readers cannot interpret it.

Backup

A separate recoverable copy of important data.

Patch

An update that corrects defects or known security weaknesses.

Data minimization

Collecting and retaining only data necessary for a defined purpose.

Worked examples

Example 1

Which term best matches this description: Transforming data with a key so unauthorized readers cannot interpret it.

Encryption is the matching concept in this lesson.

Encryption

Example 2

Which term best matches this description: A separate recoverable copy of important data.

Backup is the matching concept in this lesson.

Backup

Check your understanding

8 questions

Decimals or fractions are accepted for numeric answers. Proofs and written responses use sample answers and require human marking. This is practice, not a protected examination.

1 Which term best matches this description: Transforming data with a key so unauthorized readers cannot interpret it.

Show answer and explanation

Encryption

Encryption is the matching concept in this lesson.

2 Which term best matches this description: A separate recoverable copy of important data.

Show answer and explanation

Backup

Backup is the matching concept in this lesson.

3 Which concept would you apply first in a situation where an update that corrects defects or known security weaknesses.

Show answer and explanation

Patch

The scenario directly calls for Patch.

4 Name the concept described as: Collecting and retaining only data necessary for a defined purpose.

Show answer and explanation

Data minimization

The intended concept is Data minimization.

5 Which statement about Encryption is most accurate?

Show answer and explanation

Transforming data with a key so unauthorized readers cannot interpret it.

The definition in the lesson notes gives the required condition.

6 Explain one important difference between Encryption and Backup.

Sample answer and marking guidance

Encryption: Transforming data with a key so unauthorized readers cannot interpret it. Backup: A separate recoverable copy of important data.

Credit a clear distinction using both definitions and an appropriate example if supplied.

7 Give a short example showing how Patch would be used in practice.

Sample answer and marking guidance

A valid example should demonstrate this idea: An update that corrects defects or known security weaknesses.

Credit a relevant scenario that applies the concept rather than merely naming it.

8 Summarize why Data minimization matters in the lesson “Data protection and backups”.

Sample answer and marking guidance

Data minimization matters because Collecting and retaining only data necessary for a defined purpose.

Credit the core purpose, scope and any important limitation from the notes.

Further reading and review references

These are reference links, not copied exercises, institutional endorsement or proof of independent review.