Have quietly relied on Backups Scheduler for years. It has saved the day several times. Work your way through the options, all is there. Never a conflict with theme or other plugin. On rare occasions when I do not receive my morning email assurance that the backup completed, I find it happened to coincide with some other processes maxing out memory on the shared server causing it to hang. Go to dashboard, clear, and initiate a manual backup. (Do not close that backup page or tab until completed.) When I was a new to WP, this plugin developer was very responsive and helpful. Has since incorporated answers to those questions in his documentation. Mature plugin.