Good advice. I went through something similar and was glad I kept copies of everything we signed. My soon to be ex had a tendency to make promises and then renege like he had never said anything, so I got him to sign to some of those promises and as it turns out they are are actually legally binding where I am. Copies are vital.
The flea keeps all my emails and he would tell me to erase mine. I did as he told me. I found an old email account I use to have and found a lot of email that we had sent to each other, where he was already living with big foot and asking sex from me. I mentioned it to him the other day and he told me I should just erase that sh*t. I think he is nervous I will send them to big foot.