The answer is blob versioning and soft delete, as these two features work together to enable recovery of blob files after accidental deletion or overwrite. Blob versioning automatically preserves the state of a blob each time it is modified or deleted, while soft delete retains the deleted blob data for a configurable retention period, preventing permanent loss. On the AZ-900 exam, this scenario tests your understanding of Azure Storage data protection capabilities, often appearing in questions about recovering from user errors or application faults. A common trap is to confuse soft delete with snapshots, but remember that versioning handles overwrites and soft delete handles deletions, forming a complete safety net. Memory tip: think of versioning as a “time machine” for changes and soft delete as a “recycle bin” for removals.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which Azure storage feature enables you to recover previous versions of blob files that were accidentally deleted or overwritten?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Blob versioning and soft delete
Blob versioning and soft delete work together to protect blob data. Soft delete retains deleted blobs for a specified retention period, while versioning automatically saves previous versions of blobs when they are overwritten or deleted. This allows you to recover blob files to any previous state, directly addressing the scenario of accidental deletion or overwrite.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Azure Backup for Blob Storage
Why it's wrong here
Azure Backup provides operational backups; soft delete and blob versioning protect against accidental changes within the storage account.
✓
Blob versioning and soft delete
Why this is correct
Blob versioning preserves previous versions on overwrites; soft delete retains deleted blobs for a configurable retention period.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Site Recovery for storage
Why it's wrong here
Site Recovery is for VM disaster recovery; blob versioning and soft delete protect blob data.
✗
Geo-redundant storage (GRS)
Why it's wrong here
GRS protects against regional disasters; versioning and soft delete protect against accidental modification/deletion.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Azure Backup for Blob Storage (a managed backup service) with the native blob versioning and soft delete features, which are the correct tools for recovering from accidental deletion or overwrite at the blob level.
Detailed technical explanation
How to think about this question
Under the hood, blob versioning creates a unique version ID for each blob write operation, including overwrites and deletes, and stores all versions in the same storage account. Soft delete adds a 'deleted' state with a configurable retention period (default 7 days, up to 365 days) during which blobs are billable but recoverable. In a real-world scenario, if a user accidentally overwrites a critical document, blob versioning allows you to restore the previous version by specifying its version ID, while soft delete ensures that even if the blob is deleted, it remains recoverable within the retention window.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Blob versioning and soft delete — Blob versioning and soft delete work together to protect blob data. Soft delete retains deleted blobs for a specified retention period, while versioning automatically saves previous versions of blobs when they are overwritten or deleted. This allows you to recover blob files to any previous state, directly addressing the scenario of accidental deletion or overwrite.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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