I did that shortly after I posted my message and it seems to have fixed the problem for now. Also, my backups are stored on my google drive and last month I reduced the number of days worth of backups to retain and went into the drive via windows file explorer to manually delete some old backup files to free up some space since my last backup failed due to lack of space. I now realize I should have deleted those files via your app as it may have messed up your syncing process.
I am encountering the same problem. Backup completes and the log shows email has been sent but nothing arrives. I have another website where it works fine. Both websites are running the latest versions of wordpress and Updraftplus free version, both are provided by the same hosting service. The only difference is that the site that no longer works is an addon (sub) domain. The last email I received from the website that I am no longer receiving email from was on Feb 21, 2017. Nothing since then.
