Proton Drive to TeraBox: Free Up Space for Bulk Files You Don't Need Encrypted

Move non-sensitive Proton Drive files to TeraBox's 1 TB free tier and keep Proton's small encrypted space for what matters. Browser download or CloudsLinker.

Introduction

TeraBox advertises 1 TB free, which is roughly two hundred times Proton Drive's 5 GB free allowance — useful when you are mostly storing bulky, non-sensitive files like downloads, installers, or shared media that do not need Proton's end-to-end encryption. Proton Drive is built for privacy, and its small free tier reflects that focus; paying Proton for raw capacity to hold files that are not sensitive is a poor fit. Offloading that bulk to TeraBox frees Proton's encrypted space for the documents that actually warrant it. One thing to be clear about up front: TeraBox is not encrypted the way Proton is, so this move is for non-sensitive data only. TeraBox has no OAuth API, so the destination connects by browser cookie. This guide covers a browser download and a cloud-to-cloud transfer with CloudsLinker.

Method 1: Browser Download from Proton Drive, Upload to TeraBox
Method 2: Cloud-to-Cloud Transfer with CloudsLinker
Proton Drive vs TeraBox
Method Comparison
Practical Tips
FAQ

About Proton Drive

Proton Drive is the encrypted storage service from Proton AG in Switzerland, with end-to-end encryption applied to files, names and metadata. The free tier is 5 GB.

End-to-end encryption: files, filenames and metadata encrypted.
Free tier: 5 GB; paid plans bundled with Mail and VPN.
Hosting: Switzerland and the EU.
Focus: privacy, not bulk capacity.
Access: account email + password (2FA if enabled).

About TeraBox

TeraBox is a consumer file locker from Flextech Inc. with a 1 TB advertised free tier. It is not zero-knowledge — the provider holds the keys — so it suits non-sensitive bulk storage.

Free quota: 1 TB advertised; ~80 GB practical (20-file cap).
Per-file cap: 4 GB free / 20 GB Premium.
Encryption: server-side; provider holds keys.
Best for: non-sensitive, bulky files.
Access: browser cookie (ndus, ndut_fmt); no OAuth.

Comparison: Proton Drive vs TeraBox

These services point in opposite directions: Proton optimizes for privacy on a small free tier, TeraBox for capacity without encryption. The sensible split is to use each for what it is good at rather than treating them as interchangeable.

Feature	Proton Drive	TeraBox
Free quota	5 GB	1 TB advertised; ~80 GB practical
Encryption	Zero-knowledge end-to-end	Server-side; provider holds keys
Best-fit data	Sensitive documents	Non-sensitive bulk files
Per-file cap	Quota-bound	4 GB free / 20 GB Premium
Third-party access	Account credentials	Browser cookie only

Preparing to Move Proton Drive to TeraBox

On the Proton Drive side

Separate sensitive from bulk: only move files that do not need encryption. Keep IDs, contracts, and private records in Proton.
Have your credentials ready: CloudsLinker connects Proton with your account email and password, plus a 2FA code if enabled.
Note files over 4 GB: they exceed the free TeraBox per-file cap.

On the TeraBox side

Create a TeraBox account at terabox.com.
Create a target folder such as /Proton-Bulk/.
Pick a tier: free if everything is under 4 GB, Premium otherwise.

Method 1: Browser Download from Proton Drive, Upload to TeraBox

Step 1: Download from Proton Drive

Open drive.proton.me and sign in. Select the non-sensitive files or folders you want to offload and choose Download. Proton decrypts them in your browser and packages folders as ZIP archives.

Download files from the Proton Drive web interface

Step 2: Upload to TeraBox

Open terabox.com, open your /Proton-Bulk/ folder, and drag the extracted files in. Set aside anything over 4 GB on a free account. Free-tier uploads are throttled, so large batches take time.

Method 2: Cloud-to-Cloud Transfer with CloudsLinker

Offload Bulk Files Server-Side

CloudsLinker connects Proton Drive with your account credentials and TeraBox with its session cookie, moving files between them without downloading to your machine first.

Step 1: Connect Proton Drive

In CloudsLinker, click Add Cloud → Proton Drive. Enter your Proton email and password, and a 2FA code if you have one enabled. Proton Drive appears as a connected source.

Connect Proton Drive to CloudsLinker with account credentials

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 to copy the cookie JSON, and paste it 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 Proton Drive as the source and TeraBox as the destination with your /Proton-Bulk/ folder. Apply a 4 GB size filter for free TeraBox. Copy keeps Proton intact until TeraBox is verified.

Configure Proton Drive 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 before clearing space in Proton.

Method Comparison

Method	Ease of Use	Speed	Best For	Uses Local Bandwidth	Skill Level
Browser Download + Upload	★★★★☆	★★☆☆☆	A few bulk folders	Yes	Beginner
CloudsLinker	★★★★★	★★★★☆	Larger offloads, hands-off	No	Beginner

Practical Tips for Proton Drive to TeraBox

Keep sensitive files in Proton: the whole point of this split is that bulk, non-private data goes to TeraBox while encrypted material stays put.
Filter files over 4 GB: the free TeraBox per-file cap is the main constraint. Identify large files in Proton first.
Use an app password if available: rotate or revoke Proton credentials after the move if you prefer not to leave them stored.
Refresh the TeraBox cookie before long jobs: re-login right before exporting it.
Verify before deleting: confirm files open in TeraBox before freeing Proton's 5 GB.
Do not treat TeraBox as a backup of private data: it stores files under provider-held keys.

Frequently Asked Questions

No. Proton uses zero-knowledge encryption; TeraBox holds its own keys and can scan files. Move only non-sensitive bulk data, and keep private documents in Proton.

Yes. CloudsLinker preserves the Proton folder hierarchy; the browser method preserves it if you extract any ZIP intact before uploading.

On free TeraBox they fail. Upgrade to Premium (20 GB cap), split them, or leave them in Proton. CloudsLinker's size filter avoids queuing oversized files.

With your Proton account email and password, plus a 2FA code if enabled. Proton has no OAuth flow for third parties, so the login uses your credentials; rotate the password afterward if you prefer.

The transfer pauses and pending files are flagged. Free up space or upgrade, then resume — CloudsLinker skips files that already landed.

Yes. CloudsLinker filters by folder, type, size and date — useful for selecting only the non-sensitive bulk you want offloaded.

Data travels over TLS. Proton decrypts on export; TeraBox stores server-side under its own keys. The TeraBox cookie is tied to your session — log out and back in to invalidate it afterward.

Conclusion

For a few folders, downloading from Proton Drive and uploading to TeraBox in the browser is enough. For a larger pile of bulk files, CloudsLinker connects Proton Drive by account credentials and TeraBox by session cookie and runs the move server-side. Keep the split clear in your head: sensitive material stays in Proton's encrypted storage, and only non-sensitive bulk goes to TeraBox, where files sit under provider-held keys. Watch the 4 GB free per-file cap on the TeraBox side before you start.

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