error with snap shot restore function

Hi there,

I have a wordpress install on this domain http://littledudleyhouse.co.uk/ and has created a snapshot.

I have now updated plugins etc on the site and need to fall back. When running a restore function I get this error. Can you please advise what folder I need to change the permissions for and to what please?

Unable to create directory /home/littledu/public_html/wp-content/plugins/arconix-flexslider/images. Make sure the parent folder is writeable.

Kind regards,
Michael