In cPanel you can access an overview of the total disk usage for your account's folders and databases. You can also drill down into individual files and access a MySQL page for individual databases (if you have more than one). Your disk space allowance will also be shown in this section.
The first step is to log into your cPanel account. If you are unsure on how to do this, please view the following help article - 'How to log into cPanel'.
Scroll down to the 'Files' section and choose 'Disk Usage'.
In the 'Disk Usage' section, you can see the information about your file directories and how much disk usage those directories are using. Your disk usage and quota will be shown at the bottom of the directory summary bottom right as indicated.
If you find that you are struggling for disk space, you may want to review what directory is using up the most. Commonly, you may find that logs, mail, public_html and MySQL are the most used areas.
We'll take a look and explore those directories further.
Click onto one of your directories shown that you would like to explore further. You will find that the section is then loaded into the 'cP File Manager'. In our example we've headed into the public_html section. You can quickly see what files are taking up the most space by taking advantage of the 'Size' order.
Rather than going back and looking at another directory, from the left hand side you can change directories, or open and close the respective directories, by clicking the '+' and '-' options shown.
You should now understand viewing and understanding the disk space usage on your account.