If anyone is still running into the problem of getting warning messages that "user script file does not exist" when running this plugin with a schedule (especially if the backup still seems to work), it may be due to an old crontab entry. Try running `crontab -l | grep vmbackup` and see if you have any entries that use a directory as the argument to `run_backup` instead of just the config name. You may want to run `crontab -e` to remove all of your vmbackup cron entries and then recreate them through the plugin settings.
