Hi roulisww,
Reading through that log file in detail, there's something strange about your WordPress install's scheduler. I can see not only a scheduled task which never happens (on run (9)), but run (1) invokes a couple of minutes before the time that the WP scheduler was asked to invoke it.
a) Do you have any other plugins that may be doing something with the scheduler? Please disable them before retrying.
b) Please can you update to the development version - http://updraftplus.com/faqs/devversion
David