by Séverin Terrier.
Hi,
I've already read you didn't have shell access.
But you can perhaps adapt my command in one line when calling your backup command (remove the \ that indicate the command continues on the next line).
Or you can create a script, put it somewhere on your server to call him via your cron command.
Concerning the logging files, you can download them locally to analyze them.
Séverin
PS : of course, a direct shell access can greatly simplify things.