Backblaze's 18% Q2 Growth and $335M CoreWeave Bet Show AI Storage Can Work

Backblaze's Q2 test: real AI infrastructure traction or an AI label ahead of the proof

This report matters because tomorrow's earnings release and call will help determine whether Backblaze is becoming a credible AI infrastructure supplier or is still early enough that the AI label outruns the evidence. The headline mix is compelling either way: revenue rose 18% year over year, adjusted EBITDA nearly doubled, and the company also disclosed a $335 million CoreWeave agreement.

The bull case is that Backblaze's cheaper storage tiers are now showing up in a live AI customer environment, which could support a more valuable role in the stack. The bear case is that a smaller vendor may get treated as an AI proxy before the economics and revenue ramp are fully proven.

So the real question is not whether the quarter looked healthy. It is whether management can show three things: durable demand, a credible ramp and revenue-recognition path from CoreWeave, and an improvement in business quality beyond a stronger headline quarter.

The strategic logic: AI workloads need tiered storage, and Backblaze is aiming at the cost-efficient layer

Why tiered storage matters in AI

AI systems do not need every byte on the most expensive storage. They need the right data on the right tier at the right time. Backblaze's pitch is to serve the cheaper layer that keeps high-performance storage available for the data actively being used.

CoreWeave's agreement is described as multi-exabyte and is designed to support portions of its managed storage infrastructure while helping optimize data placement across tiers. That is the core business case investors should focus on.

A simple analogy helps: high-performance storage is like a hot range, while cheaper storage is like the pantry. If you store everything on the range, service slows down. In AI workflows, training data, checkpoints, model outputs, and RAG assets can be staged so the expensive tier handles hot paths while larger volumes sit where capacity is cheaper.

Why B2 remains the strategic business

That is why B2 matters more than Backblaze's legacy computer backup business. In Q1, B2 Cloud Storage revenue up 24% year over year already pointed to momentum, along with 76% growth in AI customers year over year and about $1.5 million in annual contract value from two new AI customers. By Q2, B2 growth had accelerated to 34% year over year, with ARR at $113 million and net revenue retention at 113%.

That progression matters because it suggests customers are not just trying Backblaze and leaving. They appear to be expanding usage over time.

Q2 improved the financial profile, but investors should focus on business quality

What got better in Q2

On the surface, the quarter improved in the two places that matter most: growth and profitability. Revenue rose 18% year over year to $42.7 million, and adjusted EBITDA nearly doubled to $13 million, with the margin reaching 30% of revenue.

The more important signal is customer behavior. B2 kept accelerating, ARR rose to $113 million, and net revenue retention hit 113%. Compared with Q1, when B2 was still at 24% growth, $93.0 million ARR, and 110% net revenue retention, the trend looks more sustained than episodic.

Management also said customers generating more than $50,000 in ARR increased 57% to 235, while a May price increase contributed about eight percentage points to growth without producing the anticipated churn. That points to a healthier mix: pricing held up, and larger customers kept expanding usage.

The proof points that matter most on the call

The AI narrative can open the door, but the call needs to reinforce that the quarter improved the quality of the business, not just the headline numbers. Investors should listen for clearer commentary on how the CoreWeave relationship translates into recurring usage, timing of revenue recognition, and broader demand across the B2 base.

What could confirm or weaken the bullish case after earnings

What to listen for now

• Why the CoreWeave deal did not lift the full-year model more. Management said the $335 million multi-year agreement added roughly $313 million of net RPO and could support B2 growth of more than 40% in 2027, but investors should ask how much of that benefit is expected to show up early versus later in the cycle.

The next catalyst: September 9 investor day

The company already said its Investor Day is Sept. 9, 2026 and that it will provide an update on Backblaze's strategy and role in the AI ecosystem. That suggests the earnings call is an important setup, while the broader strategic picture should get more detail later.

What would weaken the bullish story

• CoreWeave proves more valuable as a reference account than as a near-term revenue engine, with a slow ramp from the larger RPO base.
• The pricing benefit starts to be offset by churn or softer consumption.
• B2 growth becomes harder to sustain once the company moves beyond a small set of strategic accounts.

If those watchpoints hold, the September roadmap should be much more important. If they do not, the AI-storage story will still need more operating proof.