What is the primary benefit of using Cool Tier in Azure Blob Storage?

The primary benefit of using the Cool Tier in Azure Blob Storage is reduced storage costs. This tier is designed specifically for data that is infrequently accessed but still needs to be stored in a durable and cost-effective manner. The Cool Tier offers lower storage costs compared to the Hot Tier, which is intended for data that is accessed frequently.

Organizations often benefit by categorizing their data based on access patterns. By moving less frequently accessed data to the Cool Tier, they can realize significant savings on storage expenses. This tier is particularly useful for scenarios such as storing backups, archived files, or data that complies with retention policies, where it is recognized that while the data must be preserved, it does not require immediate access.

The other options provided do not align with the primary purpose of the Cool Tier. High-performance access pertains more closely to the Hot Tier, which is optimized for performance. Backup and disaster recovery are important use cases, but they encompass broader practices beyond just storage tiers. Lastly, there are no default settings for blobs as each blob can be assigned to a tier based on specific use cases determined by the user. Thus, focusing on storage cost-efficiency is where the Cool Tier excels.