File Transfer Protocol Guide: FTP, SFTP & More

Published {$created} by Carsten Blum

You asked about selecting the appropriate protocol for a simple storage backend that isn't AWS S3. Let’s clarify when FTP, FTPS, SFTP, SCP, and HTTPS are the best fit. The choice isn't always straightforward, and depends heavily on the application’s requirements for security, performance, and ease of management.

Understanding Protocol Trade-offs

FTP (File Transfer Protocol) itself is the oldest and least secure option. It transmits data, including usernames and passwords, in plain text. There’s almost no justifiable reason to use plain FTP in a modern environment. If you must use something akin to FTP, you're probably looking at either FTPS or SFTP. FTPS (FTP over TLS/SSL) adds encryption, but often struggles with firewall compatibility due to its reliance on explicit TLS negotiation. SFTP (SSH File Transfer Protocol) is generally the preferred choice. It operates over an SSH tunnel, benefiting from the inherent security of SSH. SFTP also sidesteps many firewall issues that FTPS may encounter. SCP (Secure Copy Protocol) is based on SSH and used primarily for simple file transfers. However, SFTP offers significantly more features and granular control; SCP is largely superseded by SFTP.

HTTPS shines for sharing files publicly. Our WeTransfer alternative for business demonstrates this capability. It's ideal for scenarios where you want to provide a simple, secure download link for recipients without requiring them to have an account. However, it is not ideal for building a full-fledged storage backend.

When to Leverage ftpGrid

ftpGrid offers a managed solution that simplifies the complexities of these protocols. We support all the major options - FTP, FTPS, SFTP, and HTTPS - and take care of the underlying infrastructure. Consider ftpGrid when you need:

• A managed service: You don’t want to manage servers or worry about security patches. Our quick start guide will get you running within seconds.
• Granular control: With features like quota management and user suspension, you have fine-grained control over account usage.
• Secure file transfers: SFTP is our recommended protocol. We also provide GDPR compliance.
• Easy public file sharing: Our HTTPS sharing functionality makes it simple to create download links.
• Scalability: The infrastructure automatically scales to meet your needs.

Cost and Implementation

Our pricing page outlines the various tiers available. For many use cases, the free tier is sufficient to get started. Unlike S3, you aren't locked into a specific cloud provider. You gain flexibility and control over your data, all while benefiting from a robust, secure, and easily managed file transfer solution.