What program to use to upload files to the server when they change?

Question

FTP

Tell me if there is such a program for windows that will monitor the specified directory and, with any changes, upload them to a remote server, preferably via SFTP or FTP.

Answer 1

rsync

Answer 2

https://syncthing.net/ works under any OS, open source, transfers data over an encrypted communication channel, works reliably.