In order to encrypt communications via FTP, which is obviously more secure, you should connect to a server using FTP over TLS. When you are using Filezilla Server this process is quite easy and can be completed in under 5 minutes.
The certificate in the following steps will generate warnings as it isn’t issued by a trusted authority, but for the sake of simply connecting to an endpoint that you already trust and making sure your transfers are secure, this is the way to go:
See: https://wiki.filezilla-project.org/FTP_over_TLS
