Berarti coba check koneksinya, pastikan bs ping ke www.googleapis.com dan juga bs telnet ke port 443nyalognya ini tuan
[2018-07-02 11:01:54 +0700] info [cpbackup_transporter] Failed with 500: Can't connect to www.googleapis.com:443 at /usr/local/cpanel/3rdparty/perl/526/lib64/perl5/cpanel_lib/Net/Google/Drive/Simple.pm line 616.
Jika gagal bs dicoba test disabled firewallnya
CMIIW