VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Filestash - Filestash is a modern client for FTP, SFTP, S3, WebDAV, Minio,...
Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.
Syncany - Syncany is an open-source cloud storage and filesharing application.
Knox - Knox offers easy disk image encryption and comes with a built-in backup service.
FTPSync.pl - FTPSync.pl is a PERL skript to synchronize a local directory tree and a remote FTP directory tree.