The data recovery setting for complex documents should be on by default. Secondary to this, why aren't my illustrator settings saved in the Creative Cloud in the creative cloud service we pay so much for? I've had a situation we're I've upgraded to a new illustrator version through CC then started to work not realising this feature is now off!!! I've done a whole lot of work in a large file and not only did it not recover the document after a crash the program reverted the document to a state 2 days prior! The file even says I saved it at close of business and yet here I am with a version of the file from the day I created it. Get your act together Adobe... I have stuck with you for years but I'm getting to the point where I'm starting to consider the competition.

You should rename the setting to "Turn off Data Recovery for documents you've worked a lot on" because this is basically what this "feature" does.

Extremely poor form Adobe....