"The error message denotes that there is an error somewhere in SSL/TLS handshake. In short, the cURL error code 35 denotes an SSL connection error. The error can be due to an outdated cURL package, connection errors or else a version mismatch between the PHP cURL and SSL protocol of the end server"

Make sure your firewall does't block our IPs

For more info http://support.simplebackups.io/en/articles/4522830-simplebackups-ip-addresses-firewall

Make sure your cURL version is up-to-date

Check your OS update method for upgrading cURL package.

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