The cPanel Disk Usage Viewer provides an overview of the disk space that your account is using. It shows disk usage totals for your account’s directories and all of its databases rather than for individual files or databases.
To view the disk usage, please login to your cPanel account and click on Disk Space Usage icon in Files section:
The bars in the graph represent disk usage figures relative to the largest directory, not according to a fixed scale. You can use the File Manager to see disk usage data for individual files, and the MySQL main page to see data usage for individual databases.
Some other import folders to keep in mind are:
/tmp for stat reports (AWStats, Webalizer)
/logs for raw web server logs
/mail for email data for all domains in this account
/etc for email login/passwords
Due to the nature of how files are stored electronically, most files occupy slightly more disk space than their actual size. For example, a 300 byte file may occupy 4 kB of actual disk space. This may cause discrepancies between the data you see in the File Manager versus the information you find in Disk Usage page.
Moreover, the disk space usage in the table above indicates how much space the directories’ contents use, not how much space the directory itself uses. Directories themselves usually use a negligible amount of disk space unless they contain a large number of files or subdirectories.
We hope this is helpful information. If you need any assistance, please contact support.