Snapshot Plugin

I have purchased the snapshot plugin and I have found limitation in it ability to restore a site. If I have a full site failure and I can’t access the back end (wp-admin) i believe this plugin can’t help me restore the site. As I would have expected that I could wipe the site, load a new blank wordpress, add the theme and restore using the snapshot plugin – can you please confirm that I can or can’t do this? I’m looking for a backup plugin which has this capability.