Since 3CX’s 16 Update 4 Alpha SFTP has been available for secure backups. The downside to SFTP is that it is often limited to be a local file server that is not resilient, scalable and is costly.

Configuring 3CX to backup to the likes of OneDrive, Google Drive, Dropbox, AWS S3, Wasabi, etc. is a simple task that takes less than two minutes.