I don't have a cpanel, as I have a heart internet server on a shared platform, Not a private server like vps/hybrid/dedicated.
But I did input /usr/bin/php5 /home/sites/theactivehealthclinic.com/public_html/wp-cron.php into schedule tasks page found in web tools at the command line to run every 5 minutes. (on my extend panel found at this https://hosting.heartinternet.co.uk/cron.cgi So i figured it was doing the same as the cpanel)
I also checked the file permissions of wp-cron and it was 644.
I did this before installing your plugin. I can do manual backups! Something i couldnt do with updraft, backupbuddy etc. I am most happy with this. However, before I purchase the dropbox permium version, i wished to make scheduled tasks work. This has not been successful. I am stumped. If I gave you my admin login for heartinternet.co.uk do you think you could help. I would of course purchase premium before or after if you are confident of it working.
Alternatively could you suggest a different server host and I will switch. The back up of my site it more important.
Many thanks,
Robin.