Disk and bandwidth in cPanel: diagnose issues
Check disk usage and bandwidth in cPanel, understand what counts toward each limit, identify large folders or traffic spikes, and reduce usage safely.
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Disk usage measures stored data in your hosting account. Bandwidth measures data transferred to and from the account. Checking both regularly helps prevent full mailboxes, failed backups, upload problems, and temporary service interruptions.
Check disk usage
- Log in to cPanel.
- Open Files and choose Disk Usage.
- Review the directory tree and sort by size if the interface offers that option.
- Expand large folders to find the exact location consuming storage.
The cPanel sidebar also shows a quick disk quota summary, but Disk Usage gives the useful folder-level breakdown.
What uses the most space
| Location | Common cause | Safe action |
|---|---|---|
public_html/ | Website files, uploads, themes, and plugins. | Remove unused files after taking a backup. |
mail/ | Large inboxes, spam folders, and trash folders. | Empty spam/trash and archive old mail locally. |
backup/ or home directory archives | Old full-account backups and ZIP files. | Download off-account copies, then remove duplicates from hosting. |
logs/ | Large access and error logs on busy or broken sites. | Download needed logs, then rotate or remove old copies when safe. |
| Databases | Post revisions, spam comments, sessions, and cache tables. | Clean through the application or phpMyAdmin with a backup first. |
Check bandwidth
- Log in to cPanel.
- Open Metrics and choose Bandwidth.
- Review monthly totals and the protocol breakdown.
Bandwidth can include HTTP/HTTPS website traffic, FTP uploads and downloads, and email protocols such as SMTP, IMAP, and POP3. A spike can come from viral content, bots, hotlinked files, large downloads, email activity, or repeated FTP transfers.
Reduce usage safely
- Move old backups to your computer or remote storage instead of leaving them in the hosting account.
- Compress large images and remove duplicate media uploads.
- Empty email spam and trash folders after confirming nothing important is inside.
- Enable Cloudflare or another CDN for static assets if bandwidth is consistently high.
- Use hotlink protection if other sites are embedding your images or downloads.
When limits are reached
If disk quota is full, mail delivery, uploads, backups, and database writes may fail. Free space immediately by removing old backups and clearing email trash/spam, then review long-term plan size.
If bandwidth is exhausted, the site may become unavailable until the cycle resets or the plan is upgraded. Open a support ticket if you are unsure whether the traffic is legitimate.
Related: Disk quota exceeded-what to do | Understanding CloudLinux resource limits in cPanel | Creating and restoring backups in cPanel | cPanel File Manager: upload, edit, organize, and delete files | Web and FTP statistics in cPanel: AWStats, Webalizer, and usage reports
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