Update blob-backup-faq.yml

Author: Daya-Patil

articles/backup/blob-backup-faq.yml

@@ -36,7 +36,11 @@ sections:
           - For vaulted backup only, reduce version retention after the first successful backup. We recommend you to keep versions for at least seven days after backup completion, or longer for large accounts with frequent changes.
 
           - If you use both operational and vaulted backup, apply the higher of the two retention requirements.
-
+      - question: | What is the impact on existing recovery points when I modify the Backup policy?
+          Can I align blob versioning retention with my backup policy, such as 42 days?
+        answer: |
+          Yes, With modify backup instance, you can assign new policy. Policy will be applied only on future recovery points. Past recovery points will still be retained as per the previous policy's retention period.
+          
 additionalContent: |
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