Free FTP-Host for Website Backups

Hey guys.

I've been looking everywhere for a reliable FREE online file hosting service which will allow me to FTP my automated website backups to their servers.

My backups typically consist of a single ZIP file of around 5mb, and need to be stored indefinitely.

Ideally I would be using Google Drive, which is perfect. But I cannot get it to work with FTP. I don't think they officially support it and 3rdparty services such as mover.io make you pay for FTP options.

Any ideas?