Backblaze B2 to TeraBox: Bring Backup Files Into a Browsable Free Tier

Move Backblaze B2 objects to TeraBox's 1 TB free tier for easy browsing and sharing. S3-compatible client download or cloud-to-cloud transfer with CloudsLinker.

Introduction

TeraBox hands a personal account 1 TB of free storage with a phone app and shareable links, which is a different role from Backblaze B2 — low-cost object storage built for backups and archival, addressed through an S3-compatible API and billed per gigabyte. People reach for this move when something they stashed in B2 as a cheap backup turns out to be a file they now want to browse or share casually, without going through a backup tool or paying download fees. The constraint to respect is TeraBox's 4 GB free per-file cap, which collides with the large archive files that backups tend to produce. Backblaze B2 connects with an Application Key ID and Application Key over its S3-compatible endpoint; TeraBox connects by browser cookie. This guide covers an S3 client download and a cloud-to-cloud transfer with CloudsLinker.

Method 1: S3-Compatible Client Download, Upload to TeraBox
Method 2: Cloud-to-Cloud Transfer with CloudsLinker
Backblaze B2 vs TeraBox
Method Comparison
Practical Tips
FAQ

About Backblaze B2

Backblaze B2 is low-cost object storage for backups and archives, with an S3-compatible API and per-GB pricing well below the hyperscalers.

Model: buckets and object keys.
Pricing: low per-GB storage; a daily free download allowance, then per-GB.
Use case: backups, archives, large media.
Access: Application Key ID + Application Key (S3 endpoint).
Interface: B2 API, S3-compatible clients.

About TeraBox

TeraBox is a consumer file locker from Flextech Inc. with a 1 TB advertised free tier and a friendly app for browsing and sharing smaller files.

Free quota: 1 TB advertised; ~80 GB practical (20-file cap).
Per-file cap: 4 GB free / 20 GB Premium.
Model: plain folder tree with a consumer app.
Cost: free tier; no egress fees.
Access: browser cookie (ndus, ndut_fmt); no OAuth.

Comparison: Backblaze B2 vs TeraBox

B2 is purpose-built for cheap, large-scale backup; TeraBox is a consumer convenience layer. The move suits the smaller, browsable files in a B2 bucket — not the archive blobs B2 exists to hold.

Feature	Backblaze B2	TeraBox
Primary use	Backups, archives	Personal browsing and sharing
Pricing	Low per-GB; download allowance then per-GB	Free tier; no egress
Per-file size	Up to 10 TB	4 GB free / 20 GB Premium
Interface	API, S3 clients	Consumer app and web
Third-party access	Application Key ID + Key	Browser cookie only

Preparing to Move Backblaze B2 to TeraBox

On the Backblaze side

Filter for browsable files: leave large backup archives in B2; pull the photos, documents, and small media you want to open.
Create an Application Key: App Keys → Create New Application Key. Note the Key ID, the key, and your S3 endpoint.
Mind the download allowance: B2 gives a daily free download quota, then bills per GB. A large pull may cost.

On the TeraBox side

Create a TeraBox account at terabox.com.
Create a target folder such as /B2-Import/.
Flag files over 4 GB for the free per-file cap.

Method 1: S3-Compatible Client Download, Upload to TeraBox

Step 1: Download from B2

Configure rclone or Cyberduck with your B2 Application Key ID, Application Key, and S3 endpoint. Pull the files you want into a local folder (rclone copy b2:bucket/path ./local).

Download files from a Backblaze B2 bucket with an S3-compatible client

Step 2: Filter and Upload to TeraBox

Set aside anything over 4 GB on a free account, then open terabox.com and drag the rest into your /B2-Import/ folder.

Method 2: Cloud-to-Cloud Transfer with CloudsLinker

Move Objects Server-Side

CloudsLinker connects Backblaze B2 with its Application Key and TeraBox by session cookie, moving objects server-side. B2 download fees still apply, but the data flows once rather than down and back up.

Step 1: Connect Backblaze B2

In CloudsLinker, click Add Cloud → Backblaze B2. Enter a display name, your Application Key ID, and Application Key (the S3-compatible endpoint is applied automatically). Confirm to connect.

Connect Backblaze B2 to CloudsLinker with Application Key ID and Key

Step 2: Connect TeraBox (Browser Cookie)

TeraBox has no OAuth, so use the session cookie:

Install EditThisCookie (V3) in Chrome.
Open www.terabox.com in the same browser, signed in.
Click EditThisCookie → Export and paste the cookie JSON into CloudsLinker.

Or copy the Cookie header (ndus=...; ndut_fmt=...) from DevTools (F12) → Network.

Connect TeraBox to CloudsLinker with the browser session cookie

Step 3: Configure the Transfer

In the Transfer section, set Backblaze B2 as the source, browse to the bucket and prefix, and set TeraBox as the destination with your /B2-Import/ folder. Apply a 4 GB size filter and type filters. Copy keeps the bucket intact.

Configure Backblaze B2 to TeraBox transfer in CloudsLinker

Step 4: Start and Monitor

Start the task and track it in the Task List. If the TeraBox cookie expires, the task pauses for a fresh one. Verify in TeraBox; B2 objects stay under Copy mode.

Method Comparison

Method	Ease of Use	Speed	Best For	Uses Local Bandwidth	Skill Level
S3 Client + Upload	★★★☆☆	★★☆☆☆	A few files, ad hoc pulls	Yes	Intermediate
CloudsLinker	★★★★★	★★★★☆	Larger sets of suitably sized files	No	Beginner

Practical Tips for Backblaze B2 to TeraBox

Leave backups in B2: large archive files are what B2 is cheapest for and what TeraBox's 4 GB cap rejects. Move only the browsable files.
Watch the download allowance: B2's free daily download quota is limited; a big pull bills per GB beyond it.
Scope the Application Key: restrict the key to the one bucket you are moving, and delete it afterward.
Prefixes become folders: B2 object key prefixes map to nested TeraBox folders.
Refresh the TeraBox cookie before long jobs: re-login right before exporting it.
TeraBox is not a backup target: it has no versioning or lifecycle rules — keep B2 for real backups.

Frequently Asked Questions

B2 key prefixes become folders under your TeraBox target. An object at docs/2024/report.pdf lands at the same path.

Yes. CloudsLinker maps B2 prefixes to TeraBox folders; an S3 client preserves them if you keep the downloaded structure intact.

They fail on free TeraBox. Upgrade to Premium (20 GB cap), split them, or leave large archives in B2 — its natural home. CloudsLinker's size filter skips them.

With an Application Key ID and Application Key over B2's S3-compatible endpoint. Use a bucket-scoped key and delete it afterward. TeraBox connects by browser cookie.

B2 includes a daily free download allowance, then charges per GB. A large pull can incur fees — check current rates before starting.

Yes. CloudsLinker filters by prefix, type, size and date — pull browsable files and leave archives in B2.

Data travels over TLS. B2 uses your scoped Application Key (delete it afterward). TeraBox stores files server-side under its own keys; log out and back in to invalidate the cookie afterward.

Conclusion

For a few files, an S3-compatible client like rclone or Cyberduck pulls them from B2 for upload to TeraBox. For a larger set of suitably sized files, CloudsLinker connects Backblaze B2 with its Application Key and TeraBox by session cookie and moves them server-side. Keep the division of labor honest: B2 stays the home for large backup archives, while TeraBox holds the smaller files you actually want to open and share. Watch the 4 GB cap and Backblaze's download fee allowance, and verify the copy before deleting anything.

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