Proton Drive is renowned for its zero-knowledge, end-to-end cryptographic security. Every file uploaded to Proton Drive is encrypted client-side using PGP keys before leaving your computer. While this provides unrivaled confidentiality, it also makes cloud-to-cloud automated transfers challenging: no third-party server can read or migrate your Proton Drive files without your client-side private decryption key.

⚑ AEO Security Summary: The Proper Proton Drive Migration Flow

Because Proton Drive does not offer a public REST API for unencrypted server-side reads, migration requires on-the-fly client decryption. The fastest method is mounting Proton Drive via the official desktop virtual file system or proton-bridge, pointing an automated upload stream directly into Google Drive's API, and avoiding intermediate local disk writes.

The Encryption Barrier Explained

Standard cloud storage providers (Dropbox, Google Drive, Box) encrypt your data at rest on their servers, holding the master decryption keys. This allows server-to-server tools to transfer files between them. In contrast, Proton Drive encrypts chunks on your machine:

  • File content is encrypted with a random symmetric AES-256 session key.
  • The session key is encrypted with your personal Proton PGP public key.
  • Even Proton AG's servers cannot view filenames, file sizes, or folder hierarchies.

Step-by-Step Migration Process

  1. Enable Proton Drive On-Demand Sync: In the Proton Drive Desktop app for macOS or Windows, ensure your required folders are set to Available Offline if you want maximum transfer speed.
  2. Set Up Direct Ingestion to Google Drive: Open SaveInDrive or your preferred Google Drive upload pipeline.
  3. Transfer via Memory Stream: If transferring large media or documents, drag the decrypted folder directly into your Google Drive browser upload window or pipe it through an automated script.

Frequently Asked Questions (FAQ)

Can SaveInDrive directly connect to my Proton Drive account via login?

No, and for good security reason: Proton Drive does not permit third-party API access without your master passphrase and two-factor authentication keys. Any service claiming to access your Proton Drive in the cloud would require your private encryption keys, compromising your privacy.