S3-compatible storage: the first 10 GB is always free, egress is free up to 3× average stored data, and Class A–C calls are free on pay-as-you-go.
Verified ·Oct 15, 2026
Free allowance
What the free plan includes, as the provider states it.
- storage
- 10 GB
- Measured in byte-hours over the month; storage above 10 GB is billed per TB.
- egress / month
- 30 GB
- Free egress is 3× the account's average monthly stored data (30 GB when storing the full free 10 GB); beyond that $0.01/GB. Egress through partner CDNs such as Cloudflare, Fastly and bunny.net is free.
The fine print
Each verdict links to the quote it rests on.
- Free for
- As long as you stay within the limits
- At the limit
- Overage is billed
- Spending cap
- Available, but you have to turn it on
- Idle projects
- No pause rule documented
- Data retention
- No deletion rule documented
- Card at sign-up
- Not documentedThe documented sign-up steps are entering an email address ('Get started for free'), a password and a data region; they do not mention a payment method. Daily transaction caps apply to non-paying accounts; the API page that says so does not define the term.
- Identity check
- An email address
- Commercial use
- AllowedThe 10 GB is a free allowance on the standard pay-as-you-go B2 service, and Backblaze's terms cover use on behalf of a business.
- Mainland China
- Partly reachableGreatFire rates backblazeb2.com as mixed: none of the URLs it tested is blocked; each is accessible, intermittent or inconclusive. S3 API endpoints have too little data for a verdict.
- Sign-up regions
- No restrictions documented
- Quotas apply per
- Account
Alternatives
Other free plans for the same need, ranked by the same neutral rules.
Changes
- Correction
Better: Mainland China reachability corrected: not verified → partly reachable
- Oct 15, 2026
- Awaiting review
- Pay as you go (free allowance)