Applications Quitting Quietly Overnight

I'm having mostly BBEdit (sometimes iTerm2) quit overnight and I can't find out why. I tried running a crontab to see if BBEdit was open every 15 minutes to find the time it was closing but it gave the wrong feedback.

Anybody know how I can chase this up? The Console isn't showing anything relevant.

Cheers

It seems an image is created on the startup drive in order to back up the startup drive.

Applications Quitting Quietly Overnight
 
 
Q