What I am about to post is mostly for new people who might not know this. I am guessing most of the vets already know.
When I first started playing (and even now sometimes) I would often accidently delete one of my good robots on accident, or even a whole team. I used to think, "Ah well... there gone. Better start over." But recently, I noticed that the game doesn't delete the bot files when you hit delete. My guess is it just removes there entry from the Teams.txt.
Thus, until you overwrite that same bot slot or team slot with another robot/team, the robots/team files are still there, and thus you can make a copy of the bots and then import them back into the game.
Again, sorry for pointing out the obvious to everyone, but I could see this being useful for someone who didn't already know about it.