Help with Configuration for Snapshot Pro

Greetings - and thanks for help on this. First effort at trying to use Snapshot Pro to backup site. Configured, as best I understood too, and ran backup but received:

An unknown response returned from Snapshot backup attempt. Aborting. Double check Snapshot settings.

I do see where the director was created in our server directory and some files are there. In particular, it "hung up" when it got down to:

Database: wp_postmeta and it occurred as it seemed to complete that line item - i.e. 100% (rows 37831/37831).

Thanks for help and ideas - I am sure it is me not following correctly the setup but I did look through and did not really change any of the settings from default. Support Access is granted if that is helpful. Thanks again! All the Best, Kerry