https://forum.howtoforge.com/threads/proftpd-ftpuser-vs-www-data-user.36249/
proftpd ftpuser vs. www-data user? | Howtoforge - Linux Howtos and Tutorials
I have proftpd running for users to upload files to a webserver with many virtual hosts. Currently I've created ftpuser/ftpgroup as non-privileged user...
proftpdvswwwdata