Backblaze B2
- Free allowance
- First 10GB storage is always free; storage above it is billed per byte-hour at USD 6.95/TB/30-days
- Verdict
- caveatusable, with a named limit or an unprobed read path
- Cost
- free tierpaid plans from USD 6.95/TB-month
- Identity
- emailno card, no phone
- Binding limit
- volume-quota10 GB of storage free; every byte above it is billed at USD 6.95/TB/30-days; egress free up to 3x the average monthly stored bytes; beyond it USD 0.01/GB, except to partner CDNs and compute services
- Evidence
- documented25 sources; a first-party page was read and the sentence quoted
- Freshness
- stale on 2026-12-04checked 2026-11-03 (live); stale on 2026-12-04
| Free tier | First 10GB storage is always free; storage above it is billed per byte-hour at USD 6.95/TB/30-days unit GB; metered on stored-bytes; Class A, B and C API calls are free on pay-as-you-go; Class D calls are free up to 2,500 a day. The API pricing page still prints USD 0.005/GB/month for storage after the first 10 GB, while the pricing page and its billing FAQ print USD 6.95/TB/30-days. |
|---|---|
| Price | USD 6.95 per TB per 30 days, pay-as-you-go, after the first 10 GB |
| Limits |
No minimum file size and no minimum storage duration fees. A public bucket needs a verified email address and a payment history on file, or a small card payment credited to the account balance. |
| Binding | volume-quota the 10 GB of free storage is the first ceiling; on the paid tier the next one is the 3x-of-stored egress allowance, which partner-CDN egress does not count against |
| Identity | email Account creation asks for an email address verified by a link, a password and a data region, and the sign-up page states 'No credit card required.' A public bucket needs a payment history or a small card payment. A help-centre article says enabling B2 on an existing Computer Backup account prompts for a phone number verified by SMS; the account-creation guide names no phone step. |
| Egress | Free up to 3x the average monthly stored bytes (byte-hours over the billing cycle), then USD 0.01/GB; unlimited and free to partner CDNs and compute services (Fastly, Cloudflare, bunny.net, CacheFly, CoreWeave, Equinix Metal, Vultr, phoenixNAP) free allowance: 3x the average monthly stored bytes; unmetered to the named partner CDNs and compute services price per tb: USD 0.01 per GB beyond the 3x allowance |
| Per-object cap | Large files can range in size from 5 MB to 10 TB; a file sent in one request is limited to 5 GB |
| Retention | No minimum storage duration fees; the pages read state no expiry for stored files |
| Interface | s3-compatible, rest S3-Compatible API (the S3 syntax, with limited ACL and tagging support) and the B2 Native API (b2_* calls) |
| Tooling | AWS CLI, AWS SDKs, AWS Tools for PowerShell and s3cmd against the S3-Compatible API; any S3 client, rclone's s3 backend among them; the B2 Native API for b2_* calls |
| Composes with | An S3 origin behind Cloudflare, Fastly or bunny.net: egress to those partner CDNs is free and outside the 3x allowance, so a CDN-fronted public bucket serves reads without the USD 0.01/GB overage. |
| Reliability | no throttle, suspension or data-loss event is stated on the pages read; usage above 10 GB of storage or above the 3x egress allowance is billed automatically |
| Notes | S3-compatible object storage: confirmed. B2 Overdrive, the higher-throughput tier, starts at USD 15 per TB a month with unlimited free egress and needs a multi-petabyte commitment, so it is not a separate entry point. Payment is by credit card or invoice. |
| Evidence note | documented every value is quoted from a first-party Backblaze page read on 2026-10-30; no request was made against the service, so the read path is unprobed. A probe of a public object would raise it to measured. |
| Parsed numbers |
|
Evidence 25
| date | source | what it proved |
|---|---|---|
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | storage is billed per byte-hour at USD 6.95/TB/30-days |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | the first 10 GB of storage is free with no time limit |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | egress is free up to 3x the average monthly stored bytes |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | egress beyond the 3x allowance costs USD 0.01/GB |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | egress to the named partner CDNs and compute services is unlimited and free |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | there is no minimum object size charge and no minimum storage duration charge |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | Class A, B and C calls are free; Class D calls cost USD 0.004 per 10,000 after 2,500 free a day |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | B2 is S3-compatible object storage |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | B2 Overdrive needs a multi-petabyte commitment |
| 2026-10-30 | www.backblaze.com/cloud-storage/pricing | pay-as-you-go is paid by credit card or invoice |
| 2026-10-30 | www.backblaze.com/docs/cloud-storage-s3-compatible-api | the S3-Compatible API accepts applications written to the S3 API |
| 2026-10-30 | www.backblaze.com/docs/cloud-storage-large-files | the largest object is a 10 TB large file; a normal (single-request) file is limited to 5 GB |
| 2026-10-30 | www.backblaze.com/sign-up/cloud-storage | the B2 sign-up asks for no credit card |
| 2026-10-30 | www.backblaze.com/docs/en/cloud-storage-enable-backblaze-b2 | account creation verifies the email address by a link, then asks for a password and a data region |
| 2026-10-30 | www.backblaze.com/docs/cloud-storage-create-and-manage-bucke | a first public bucket needs a payment history or a small card payment |
| 2026-10-30 | help.backblaze.com/hc/en-us/articles/360035350993-B2-Quick-S | enabling B2 on an existing Computer Backup account prompts for an SMS-verified phone number |
| 2026-10-30 | www.backblaze.com/cloud-storage/transaction-pricing | the API pricing page prints USD 0.005/GB/month for storage after the first 10 GB, a figure the pricing page no longer uses |
| 2026-11-03 | www.backblaze.com/cloud-storage/pricing | storage is still billed at USD 6.95/TB/30-days per byte-hour |
| 2026-11-03 | www.backblaze.com/cloud-storage/pricing | egress is free up to 3x the average monthly storage |
| 2026-11-03 | www.backblaze.com/cloud-storage/pricing | egress beyond 3x costs USD 0.01/GB |
| 2026-11-03 | www.backblaze.com/cloud-storage/pricing | egress to or through Cloudflare and the other named partners is unlimited and free |
| 2026-11-03 | www.backblaze.com/docs/cloud-storage-deliver-public-backblaz | public B2 buckets can be served through Cloudflare's CDN with no Backblaze download fees |
| 2026-11-03 | www.backblaze.com/sign-up/cloud-storage | the B2 sign-up page asks for no credit card |
| 2026-11-03 | www.backblaze.com/docs/en/cloud-storage-enable-backblaze-b2 | account creation verifies the email address by a link |
| 2026-11-03 | www.backblaze.com/docs/cloud-storage-create-and-manage-bucke | a public bucket needs a payment history or a small card payment |