by Ken Task.
What are the settings?
Like this?
Skip courses not modified since backup | backup_auto_skip_modif_days
Default: 30 days
Choose to skip courses that have not been modified since a number of days
Skip courses not modified since previous backup backup | backup_auto_skip_modif_prev
Default: No
Choose whether or not to skip courses that have not been modified since previous backup
And how often is cron job running? Is it running successfully?
'spirit of sharing', Ken