What should be deleted when a portable app is closed?
I'm not new to portable apps and have been using them for the past six years.
I usually take a separate back-up of my data at work just for my own piece of mind. To do this I use Synkron portable. It's nice and convenient. I assumed that most portable apps install 'something' to the host machine when they are opened, but then 'clean their trail' when they exit.