Wordpress Online Backup Vault SSL connection error

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Can you help? Receiving this error message when attempting to connect my WordPress installation with backup vault:

>>>Please ensure your blog is able to perform HTTPS requests to https://wordpress.backup-technology.com. You may need to contact your web host regarding this. The error was: [Error Code http_request_failed] SSL certificate problem: unable to get local issuer certificate.<<<

I have several WP installations on my VPS add-on domains.

Thank you.
While I do not know exactly how the code to the plugin works, some testing can be done to ensure that you are able to successfully make HTTPS requests to that particular location. The following is some example code that you can use to test the connection to their server over HTTPS: Example code for testing your connection over HTTPS using cURL and PHP