Design data storage solutions →easyMultiple Choice

AZ-305 Design data storage solutions Practice Question

Exhibit

Refer to the exhibit.

```json
{
  "properties": {
    "isVersioningEnabled": true,
    "deleteRetentionPolicy": {
      "enabled": true,
      "days": 7
    },
    "restorePolicy": {
      "enabled": true,
      "days": 30
    }
  }
}
```

You are reviewing the data protection settings of an Azure Blob Storage container using the above JSON. Which of the following is true?

⚠ Common exam trap

A common mix-up: candidates confuse versioning with soft delete or point-in-time restore, assuming that versioning alone provides a specific retention period or point-in-time recovery capability, when in fact versioning retains all versions indefinitely unless a lifecycle policy is applied.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Previous versions of blobs are retained

The JSON shows that the `versioning` property is set to `Enabled` for the Blob Storage container. When versioning is enabled, every modification to a blob creates a new version, and previous versions are retained indefinitely (or until explicitly deleted or a lifecycle management policy removes them). This directly supports the statement that previous versions of blobs are retained.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Deleted blobs are retained for 30 days
Why it's wrong here
This statement is incorrect because the delete retention policy for this storage account is configured for 7 days, not 30 days. Soft delete retains deleted blobs, snapshots, and versions only for the specified retention window, which is 7 days in this scenario. After that period, soft-deleted items are permanently purged and cannot be recovered.
✗
Blobs can be restored to any point within the last 7 days
Why it's wrong here
This statement is incorrect because the point-in-time restore policy for this account is set to a maximum of 30 days, not 7 days. Point-in-time restore allows you to roll back blob data to an earlier state within that 30-day window, but it does not limit recovery to the last 7 days. This option confuses the restore policy duration with the soft-delete retention period.
✓
Previous versions of blobs are retained
Why this is correct
This statement is correct because the account has blob versioning enabled (isVersioningEnabled is true). When versioning is enabled, every modification or deletion of a blob creates a new version, and all previous versions are preserved. This allows you to retrieve or restore an earlier version of a blob at any time, independent of soft-delete or point-in-time restore policies.
✗
Versioning is disabled
Why it's wrong here
This statement is incorrect because the property isVersioningEnabled is set to true, which explicitly indicates that blob versioning is enabled, not disabled. If versioning were disabled, the property would be false, and previous blob versions would not be automatically retained. The presence of true confirms that the account is using versioning as part of its data protection strategy.

Quick reference

Azure Blob Storage Tier Comparison

Tier	Storage Cost	Retrieval Cost	Latency	Use Case
Hot	Highest	Lowest	Immediate	Active data, frequent reads
Cool	Lower	Higher	Immediate	Data accessed < once / month
Cold	Lower still	Higher	Immediate	Data accessed < once / quarter
Archive	Lowest	Highest + rehydration delay	Hours	Long-term compliance retention

Go deeper

AZ-305 Design data storage solutions Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

Azure Blob Storage Tier Comparison

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