Application Keys have received a significant boost, starting with Multi-Bucket Application Keys, which make it possible to create a single key that can be used for more than one specific cloud storage bucket. This enhancement provides more granular control over bucket access, reducing the attack surface. 

Secondly, Backblaze is now offering Scalable Application Keys, enabling the generation of up to 10,000 unique, short-lived data access keys per minute. This Reduces the exposure window of individual keys, thereby reducing the attack surface for endpoint-generated content and high-volume data operations.

Another new feature is Custom Upload Timestamps, which let users specify the exact upload time for stored objects. This feature is critical for maintaining data integrity, supporting precise versioning, and meeting specific compliance requirements.