Step 1 To restore a backup you first need to log into your cPanel screen and click on the 'Backups' option.
Step 2: You then need to browse yrou computer tolocate yoru backup files and then click on the 'Upload' options. You will need to restore your databases one at a time.
And that's it.
If you have restored a database you may need to reconnect it to your site.
Please see http://www.shouthosting.co.uk/billing/whmcs/knowledgebase.php?action=displayarticle&id=99