Site in offline mode, any way to debug how this happened? I came in this morning to find my companies site in offline mode. I personally checked with the only other site admin, and none of other users have the ability to turn off the site. I was using the Backup module prior to me leaving last night, but I've backed up hundreds of times and never encountered the module leaving the site in Offline mode.

Would there be any logs or any location in the database where this activity might be logged? We don't allow users to login to our Drupal site, just our own editors and a

I've tired Googling answers but I haven't got very far :( 

running Drupal 6.x
Site offline is a matter of a global variable site_offline set to 1. Any call of variable_set('site_offline', '1') can also result to put site into offline mode.

Invalid database configuration can also results as site offline but it adds some error message.

Unauthorized access to DB can be used to manually alter record in variable table for the values as
variable.name='site_offline', variable.value='s:1:"1"'