David,
Here is a link to the what I believe is the error log. The last entry is
[10-Mar-2015 06:00:43 UTC] PHP Fatal error: Class 'XMLWriter' not found in /home/wfswovbv/public_html/wp-content/plugins/updraftplus/oc/guzzle/Guzzle/Service/Command/LocationVisitor/Request/XmlVisitor.php on line 198
Thanks,
Matt