Understand Backblaze B2 Data Caps and Alerts

You can limit the charges that occur per day due to storage, downloads, or transaction usage. For details about viewing, setting, and managing data caps and alerts, see Create and Manage Caps and Alerts.

A data cap is a limit that you can place on the amount of money that is spent per day. Each category includes a number of free transactions. If you stay within the free usage limits, you are not charged. Usage counters reset daily at 12:00 AM GMT.

The following transaction classes are available:

• Class A: Covers uploads and write operations
• Class B: Covers downloads and read operations
• Class C: Covers listing operations and bucket or application key management
• Class D: Covers service-related operations, including Event Notifications outbound calls

You can set data caps for storage and for Class A, B, and C transactions. Data caps cannot be set for Class D transactions.

Alerts are triggered when usage reaches 75% and 100% of the cap value that you set.

If you do not set up data caps, your Backblaze B2 Cloud Storage account usage is unlimited, and unlimited charges can accrue.