I too am having problems getting this to work. I am hosted in InMotionHosting. Running PHP5.3.27, WordPress 3.6, and WordPress Backup to Dropbox Version 1.5.5
It appears to be setup properly in the dashboard. It links to the dropbox and it created the following:
I know this looks great but It only seems to be working manually. And only after I de-activated the plug-in and then re-activated it.
The email notification I receive no matter what day of the week tells me that the backup occurs on Sunday (I have it set to backup daily).
So, how do I fix the daily automatic backups, and the seemingly (perpetually) wrong time in the emails (and log)? Here is saturdays's log entry:
01:28:53: Backup started on Sunday August 4, 2013.
But it doesn't matter, every day says the same thing. Always Sunday.