Security Protocols
Never choose a client that relies solely on plain FTP. Ensure the software supports SFTP and FTPS. These protocols encrypt your credentials and data, preventing man-in-the-middle attacks. Look for clients that support SSH key-based authentication, as this is more secure than traditional password-based logins.
User Interface and Workflow
A dual-pane interface is the industry standard for productivity, allowing you to see your local files on one side and the remote server files on the other. Drag-and-drop functionality, saved site managers, and tabbed browsing are essential for managing multiple server connections efficiently.
Synchronization and Automation
For developers, automated synchronization is a game-changer. High-quality clients can compare the differences between your local and remote folders, updating only the files that have changed. Some tools also offer scripting capabilities to automate routine backup tasks.
Connection Resilience
Network interruptions happen, especially with large file transfers. Look for clients that support "resume" functionality, which allows a file transfer to continue from where it left off after a connection drop, rather than restarting the entire process.