xcloner.log empty on crontabs

When I run XCloner from the crontab with logging set then the only entries I get in the xcloner.log are:
Log output started
Log output started
Log output finished
Log output started
Log output started
Log output finished

Which isn’t very helpful.

Can you look into this?

http://wordpress.org/extend/plugins/xcloner-backup-and-restore/