Change default FTP port for greater security for the server and to its contents, if the server is a shared one. Not only because the default port gives you a connection automatically and if they could guess the password, your content is in risk. So, I would suggesto to change the FTP port to a non standard one.
The PureFTP daemon is easy to configure on a cPanel server using WHM or the PureFTPd configuration file. For those looking to set up FTP from command line (such as for automation purposes), you can use cPanel’s built-in template system to apply configuration options that will not be overwritten during cPanel updates.
It is very common in cPanel servers that they run out of disk space. It can be mainly because of the website users eats up the entire disk or the log files fills up or the backup fills up the entire folders.
The folder permissions and ownership is one key to the security of the website sand your codes. Here's how to keep them safe so that any hacker wont deface your websites.