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.
Nearly all abusive e-mail messages carry fake sender addresses. To help prevent this sort of abuse, it is recommended to add SPF record as well as DKIM to publish yourself and your identity.
Keep your ClamAV software and it's virus definitions is critical in maintaining your web server's security. Learn how to activate and update ClamAV on a cPanel.
cPanel comes with a self monitoring and alerting mechanism so that is a service goes down, it will try to restart it of its own and if that fails, the corresponding server admin will be notified. Learn how to monitor and manage services on a cPanel server.