Go to cPanel and click on "File Backups" under the JetBackup-section:
Select the date that you want to restore:
Select the file or directory you want to restore, in this case we'll restore the "cache" directory and "piwik.js" file:
You first select the file(s) or directories, then click on "Restore Selected", and then click "Add to Restore Queue".
The restoration will then proceed: