Making a secure copy from / to site - and let's face it FTP is dead dead dead - If you have not done so it already then drop FTP
It could basically not be simpler - once ssh is in place on your system and web server just write:
COPY TO SITE: scp ./somefilename.* username@example.com:exampledirectory/ COPY FROM SITE: scp usernamee@example.com:exampledirectory/filename.* ./
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