AZ-305 Design business continuity solutions Practice Question
A company runs critical Azure VMs. They want to protect against accidental deletion or corruption of data by implementing a retention policy for Azure Backup. They need to keep daily backups for 30 days, weekly backups for 12 weeks, and monthly backups for 12 months. Which Azure Backup feature should they configure?
⚠ Common exam trap
Candidates often confuse Immutable vault or Soft delete with retention policies, but those features address data protection from deletion or tampering, not the ability to specify granular retention durations for different backup frequencies.
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
✓
Backup policy with long-term retention
A backup policy with long-term retention (LTR) in Azure Backup allows you to define granular retention rules for daily, weekly, monthly, and yearly backup points. This directly meets the requirement to keep daily backups for 30 days, weekly for 12 weeks, and monthly for 12 months by configuring the retention duration for each frequency in the backup policy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Immutable vault
Why it's wrong here
Immutable vault, enabled on a Recovery Services or Backup vault, enforces a backup-lock state that prevents users from deleting backup data before the expiration of the configured retention period. However, it does not provide controls to define the actual retention durations or the granularity of recovery points; these must be defined in a backup policy. Therefore, an immutable vault protects the data that the policy retains but cannot by itself meet the requirement for distinct daily, weekly, and monthly retention settings.
- ✓
Backup policy with long-term retention
Why this is correct
A backup policy in Azure Backup is the mechanism that defines both the backup frequency (when recovery points are created) and the retention rules that govern how long each recovery point is kept. By specifying a daily backup with 30 days retention, a weekly backup with 12 weeks retention, and a monthly backup with 12 months retention, the policy can create and automatically prune recovery points according to these exact schedules. This directly satisfies the stated requirement for different retention durations across daily, weekly, and monthly recovery points.
- ✗
Backup tiering
Why it's wrong here
Backup tiering, such as the archive tier in Azure Backup, is designed to move older recovery points to lower-cost storage while preserving them for compliance or long-term archival needs. It does not itself set retention durations—it only moves data to a different tier based on a defined age threshold (e.g., 30 days). To actually enforce the required daily, weekly, and monthly retention windows, a backup policy must still be configured, making tiering a complementary cost-optimization feature rather than a standalone retention solution.
- ✗
Soft delete
Why it's wrong here
Soft delete is a safety feature that retains deleted backup data for a default period—typically 14 days—after an administrator deletes a backup or stops protection. This prevents accidental deletion and allows recovery within that window, but it does not allow configuration of different retention durations for daily, weekly, or monthly recovery points. It is also not a substitute for a backup policy because it only affects data that is being deleted, whereas the requirement here is about proactively defining how long to keep active backups at different cadences.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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